Can you supply a base plan so we can see how the space is fitting with surroundings?

How are you going to use your backyard? That matters.

Do consider adding a bird bath somewhere. If your location ever has freezing weather, make sure the water bowl is wider on top than at the bottom (not straight vertical sides) so the ice can expand w/o breaking the bowl.

https://www.walmart.com/ip/Union-61010-25-x-17-White-Round-Bird-Bath/19215391?wmlspartner=wlpa&selectedSellerId=1172&adid=22222222227016750626&wl0=&wl1=g&wl2=c&wl3=52485411671&wl4=aud-273067695102:pla-84048546551&wl5=9011047&wl6=&wl7=&wl8=&wl9=pla&wl10=8453398&wl11=online&wl12=19215391&wl13=&veh=sem&gclid=EAIaIQobChMIl678rN-R3gIVDlYNCh3xHAb1EAQYBSABEgKhg_D_BwE

Unless your shed color was chosen because it is the same color as your house, you might consider repainting it a darker color -- similar to the coloring of the fence to make it more visually disappear.

What planting zone are you in? If you're in Zone7, consider Aucuba bushes that keep their leaves year round and, in my experience, are easily maintained -- and mine are planted in Georgia red clay (put some topsoil in a clay hole). Just feed them a bit of Miracle Grow monthly from early spring to fall.

https://www.eastcoastgardencenter.com/plant-index/shrubs/item/aucuba-gold-dust.html

@ Yardvaark, is this what you are looking for? Thanks for your response.

@ suezbell we are in Zone: 8a (According to the new 2012 map) . Currently the shed has primer on it. what color do you recommend? I want to use the backyard for relaxing, entertainment. I would like to add a bird bath

Yes, Hacob Chacko, a plan like that ... except it needs to be updated to include all of the existing features -- fence, shed, walk, walls, trees & whatever else exists. Also, it needs to be bigger by about 4X and have all the extraneous information removed so that it is readable.

Existing tree may not appreciate being built over or being used as a place to store debris - time will tell.

Would not overly complicate your backyard landscaping. You know how you want to use this space, now decide how much open space for the amount of entertaining you want to do -- just several people at a time or larger crowds? -- and keep in mind how much time, effort, energy and money you want to spend tending to landscaping. I find planting low maintenance shrubs (Aucuba, Abelia

Both the shrubs, Aucuba -- great for planting beside (couple of feet from) buildings --

https://www.plantingtree.com/products/gold-dust-aucuba?variant=41918077572&gclid=EAIaIQobChMIsN6W5P-T3gIVloKzCh3c5Q7sEAYYASABEgLJkfD_BwE

and Abelia,, which butterflies love,

https://garden.lovetoknow.com/wiki/Abelia

and the flowering plant -- Liriope -- good for outlining sidewalks or driveways --

https://www.pinterest.com/pin/248120260697266142/?lp=true

will grow in Zone 8.

There are paints that have a wood look -- you might choose one that resembles the finish of your fence.

https://www.google.com/search?biw=1366&bih=650&tbm=shop&ei=DJjKW66eNIixggf0_qLwBw&q=exterior+brown+wall+paint+that+looks+like+wood&oq=exterior+brown+wall+paint+that+looks+like+wood&gs_l=psy-ab.3...5912.6487.0.8510.5.5.0.0.0.0.91.394.5.5.0....0...1c.1.64.psy-ab..0.4.322...33i10k1.0.ATUjcD-BSm0

Rather than plant a lot of bulbs and seeds that can require a lot of tending , you might consider adding brackets for hanging baskets and/or wind chimes and/or bird feeders and/or seasonal decorations to your fence for summer flowering plants that can add color and will not be in the way of your mower.

You could also add some hanging brackets to strategically placed 4"x4" treated posts -- atop which you could also add a solar light, some of which have motion sensors.

Consider the path of the sun -- and shade and shadows -- as you decide where to put any picnic table or other seating.

Pay attention to usual wind patterns if you will be placing patio blocks to create a small patio for either your picnic table and/or seating and/or your BBQ grill. If the wind usually blows west to east or vise versa, place your grill downwind of the seating so you're not "smoking" your family or guests.

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@Yardvaark, would this work?

@Yardvaark, Thank you for the detailed response. I added more details to the plan. I am thinking of growing a vine on the pergola. The old shed on the right side will be removed. still working on the flagstone patio under the pergola

There are some discrepancies in the drawing measurements as the area on the bottom side of house is more pinched than the photos show. I'm fudging the drawing, which stretches the left side. You'll need to fix the base measurements before you work out the proposed elements. You always want to make sure the drawing is accurately measured and drawn so you know that the elements you conceive will really fit and be proportionately pleasing (like your drawing looks.)

I'm advancing the drawing another notch, showing how the bed lines could be arranged, where a couple of logical places for small trees and some spots of color are.

@Yardvaark, forgot to add the new drawing?

Yes, I forgot!

A small point, but I think it is worth pruning and grounding the tree as artistically as possible as it is a specimen visible from the house and highlighted against the the shed. What kind of tree is it? It might even deserve uplighting...

@kitasei, which tree are you asking about? The one next to the pergola is plum

@Yardvaark, Thank you. What are the red squares in the plan?

Red rectangles are extra colorful plants -- commonly called "color" -- whether it be annuals, perennials, or shrubs. They are not necessarily matching.

A plum is a perfect candidate for artful shaping. I don't mean topiary, of course. Just make sure it is charming.