Heya, it looks pretty sweet already. I think the biggest problem you have is the big brick wall stealing all the attention. With textures, the inner variation is a lot more important than the shading. try to break up the bicks less evenly. Take a look at this texture from team fortress 2:
Check out how they but all the emphasis in the texture in the variation between the bicks while most of the texture is just a monotone flat color. Take a look at how they make larger blops out of similar coloured bricks to make it interesting.
Try to break it up a bit. Walls are rarely this bare, if you go to a real bar you'll see they pack the walls full of pictures and quriosities. check out this picture I googled:
In the world of your game, what would the bartender like to show his visitors? probably he's been working there for years and met a lot of adventures who've left souvenirs.
tl;dr
- simplify bricks, get rid of shading
- add variation in brick color
- hint at objects that tell a story about the location
