Locomotive Breathe

Out of all the thumbs you posted on your thumbshare thread, I think this picture is the best one and my personal favourite.  The cutting-out of the train is very neat and free of pixellation; the mist/smoke is smooth and blends in well. The lighting is a bit chaotic and disorganized, but the diffusion of it follows the light sources better than it does in the other picture. There could be a bit more contrast and shadow, but otherwise, job well done!