Maybe a little volumetric fire as a source for the smoke, darker atmosphere for mood with some isolated light source effects? Something bugs me about the closest catapult, maybe a tiny bit of bump/tex. I had a ship like that,I added bump, didn't show up real well...and any increase looked like too much. The back drop trees are great, the modeling is good, scale looks good. I like the smoke and DOF. Probably going to be a render-bear with figures and additions. Nice Start, can't wait to see the finished product. ICM