I must say I find the tall ones , a bit disproportionate to the rest , try it with one third off, (the top sheets) and lets see . I would then align the middle tall one(now reduced) to the bottom of the one next to it ,then I would also reduce the distance between all the frames to about 4" in between. Even if the display is not the whole length of the stairs, as long as the distance at the bottom of the stairs is the same as the distance at the top of the stairs, it will work,

Who would paint redwood???? That's a total sin against the wood gods. Don't waste money on a premium upgraded wood like that if you want paint. Go with cheap paint grade poplar for half the price. And don't do cream paint to walk on unless you want to repaint every 6 months.

Paint all of the wood white ,instant update,cream with red could make it look dirty and dated

Empty out the furniture and fixtures there, including the lamp and ceiling fixture.Use a storage bench instead for a place to sit and remove shoes. Shoes or backpacks can be dropped inside it. You can get much better lighting from a fixture that has lights to wash the ceiling and to light the floor. What is under your stairs? Do you have room to install some storage there? Pull out stair drawers might work for shoes, and you might add some pull outs under the stairs if they are suited for it. A foyer should serve to introduce you, your style and the decor to be expected in the adjoining rooms. I would key furnishings and paint to what is going on in the rooms left and right of the foyer. Everything I see hanging on the walls is hung too high. The general rule is that the center point of a single piece or a grouping should be 5' above the floor. If the first piece at the bottom of the stairwell is hung at that level, you can use painter's tape to tape the center line all the way up the stairs and arrange pictures above and below the line, with a few centered right on it for a more pleasant arrangement. Not knowing much about the rest of your home or your personal style, I might suggest you paint a soft color like Sherwin WIlliams Sea Salt.