I think as far as shading goes, the shadow for the banner is a bit too low.
if a piece doesn't seem to require a lot of shading according to your art style you can always add texture so it won't seem as empty
Simply find a subtle texture and overlay it on the piece
English
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You mean like something on the wall itself? Like symbols as in this image?
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http://www.deviantart.com/art/How-I-add-texture-157962826 Not the best example but this is what I mean
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Ah, I see. Now I understand.