woop,see that? instant-interesting.
the train could be pushed even more in terms of saturation,make the green alittle more green,and the orange on the train really strong. (keep expermenting..)
(i hope i'm a good one,rather than bad )
i'll leave the crits on the pencils to guys who know what they're talking about (haven't used pencil in seems-like-forever),although i agree with hurri that your faces still need work.