Over all it is pertty good but I have a big problem with superman shoulders they don't work - they look like they are sitting on top of his real shoulders - one you have the flow of the muscel flowing from the chest into the should all wroung - me personally would have made his chest a little bigger
I think all you need to fix this is to study some bodybuilding mags or go back to the anotomy books - A great one is by Andrew Loomis
Most comicbook artist who only study from comic or related material will make mistakes like this - the book by Andrew Loomis will give you the proper fundation to start from and then you are equiped with the proper knowlge to exthgerate the figure
Thanks guys,.... if any of you, is interested in inking my samples, please leave me a note, and will definitely send you a high res file.. if you wish to color it though... these lines are not yet clean, and i suggest you watch out for the inked versions of this piece that will be posted on whoever,s d.a account that has finished inking it. thank you very much guys.. i really appreciate it.