Hm... the BT, while having quite nice features and spot on textures is... still looking a little bit flatty. I'd say perhaps try what skorak Said, and perhaps add a few more things like the ram in front, to reduce that.... flatty look. Hm... just thought of this... how about keeping the back cca the same width, but decrese the width gradually to the front? So you get something like sorta letter "A" shape? Or perhaps keep the width at the back and 1/4 leght, than gradually decrese it to... maybe 2/3 of the width over a small portion of its's length, and keep the rest at the 2/3 width...
I hope I described it in such a way it's understandable.