i think it looks good. it is hard to get a real theme going with that small of a tank.
i personally like a look with lots of caves and a little more open space. the problem with a small tank is if you have stuff too open you wont have much rock to put your corals on. i think that the look you have is good but maybe try to get a few more caves near the bottom by putting bigger rocks on top of smaller ones. you will get more flow through your rock and it will help with the detritus build up too.
i ended up taking out around 30lbs of rock out of my 60 gal. tank. the tank still looks very full and i was able to get a 30 gal. tank going with out having to buy new rock.
the tank does look very clean and that brain you have at the front looks incredible.