Were you going to place it below the sconce? It's hard to tell the scale from this angle, but I think I would opt for a few smaller photo frames just because I feel like if I were to use a single large piece, it may appear too low under the sconce.

thx guys,good idea for me,Placing the separated pics is better choice for this wall with lamp in the middle place

Is it possible to move the light higher and put a grouping of pictures below

Place cluster of art/pictures above, below, around the sconce.

Consider mounting a mirror there instead of art. You can mount the sconce on the mirror, have this done by a professional glass company. It would look nice to have a reflective element as you come down the stairs.

I like the suggestion of a large mirror with the photos following up the stair.

I would do a grouping of mirrors

you do'nt really need anything there..sometimes less is more :)

Use Charmean's suggestion about the mirror combined with the sconce, then line the other walls with art--either one large painting on either side or several smaller works.

sorry :) i guess i'm the person who doesn't like mirrors :) if you do though, it's fine.
i wouldn't want to see myself walking down the stairs, you know? with extra light?
i don't like mirrors in dining rooms either. i don't want to watch myself eat. i don't like mirrors over fireplaces, or TV's!!! i'm a grinch :) i'm not sure why something has to be in that space. maybe a tapestry or quilt would be an idea? again, i'm sorry to be disagreeable :) :)

Hey, mirrors aren't for everyone. But the sconce is too small for the space, so maybe just a much bigger, possibly custom, light fixture on that wall.