I don't see this house with a big front porch. I think it is very beige. Find a different color that complements the stone for the siding. Then I think new landscaping might help. Tough to tell about that though with the snow

so much depends on how you need to use the space(s)

you look set back, I would enclose or create a private seating the Aqua door area with the verticle windows into a patio with a pergola over top... Landscaping will add a lot to the front, a porch, not so much.

a bigger landing, yes.

I don't like the bow window, but I don't know how you will use it from the inside.

I'd make it a flush window and make a walking path from the other aqua door to the front door.

Your desire for a large front porch and natural stone could be translated into a front courtyard created with landscaping. The before and after photos below are from a recent thread asking for help with landscaping. The after photo is from Dig Doug’s Designs. I think a similar approach to this house you’re considering buying might work very well.