You've got a great concept here, but I'd say it could use a lot of work. For modelling you could do a lot, you've got a lot of polygons that are pretty much worthless if you're going for low poly. The main structure also looks extremly bumpy on top. The texturing work is really noise. Maybe look into how metal tends to…
ALthough You've improved an your colors and texture there is much to be disired from this piece. 1. The guns at the front particular the gun on the outer side of the front. The hole the gun fits in seem to have no thickness on one side. This looks weird and is quite obvious. Also the holes for the gun are too sqarish.…