I could never waste shelf storage space with frames whether empty or with a picture within. Surely you have wall space for hanging pictures. Studio 100001's Colorful Elegance appeals to my style the most: objects and mementos included with the things you really need to store in the shelves, but those object and mementos must have value. When I look at homes I sometimes wonder, "Where is the value in this displayed object? " If it is an empty picture frame I would want it to be an antique and unusual. Otherwise I would think the owner just didn't know what to do, or started a project and didn't follow it to completion.

Depends on if it is your main bedroom. If it's more of a guest bedroom, a daybed with built in store could be a great option. Then all you need is the desk and maybe some shelving

I would make a floor to ceiling headboard with hollow core doors; three might be wide enough and cover one of the windows but first I would put a blind inside the window and flip the louvers on an angle to camoflague the back of the headboard so it looks good from the street. This could be done with a conventional king sized bedspread stapled to wall and framed out with trim. Simple panels and trim. OR just install a blind in the windows to match so they look the same from outside and hang a lined curtain centered on the wall that doesn't open at all but looks centered on the wall and then install the bed nightstands lamps etc. Fabric sheets can work here; 7 yards of fabric in flat king sheet. Have curtians 2.5 to 3 times wall width for nice gathering that stands up and doesn't look wimpy.

You have a really neutral palette from which to start so it shouldn't take much to make the room more inviting. What colors do you like? I would suggest some sort of end table for a guest to set phone and a glass of water. Since you have an air return, you'll want something open. Maybe a small C table with wall sconces on either side of the sofa for reading in bed. This table from Target should fit well in the space and is only $60. These adjustable wall lamps are only $99 for a set of 2 from Lamps Plus with free shipping. I think a little chrome will brighten up the corner a bit. Your pillows are pretty. Consider adding a third color like teal. Then you could add a pretty orange or teal throw to the sofa. This artwork is mounted on wood. Its 36x24 and $125 from art.com. http://www.art.com/products/p26900195926-sa-i8138176/sydney-edmunds-gum-drop.htm?sOrig=CAT&sOrigID=1822&dimVals=1822-23945&ui=A7DEA17D9A73449F965DA794503EB427 As far as your bookshelf, I think I'd look for something with partially closed storage so you can store personal office items but still have room for display. Hope this helps!