[LordZen]

Two suggestions:

Firstly, trains are man-made, and well you'd simply expect the outline to be a bit straighter, make it seem more mechanical. The lines go off at odd angles at some points for me.

Secondly, I cant say I like the coloring style. You should take into consideration that that train's front would be uh somewhat cylinder shaped. So the light wouldnt be hitting at all those angles so evenly.