OMG!!! just WOW!!! you are really good with details I too want to make my own comic/manga but I ain't good with drawing *sigh* I really want to make my own manga so badly T .T and I would reflect it to the most saddest part of my life... blah blah anyweiz keep it up specially with the details(never gud with that) and the shadowing too(that too)
If art is truly something you want to do, then I suggest by just practicing! Go to the library and borrow tons of manga magazine and just draw what you see! You never know how far you'll get when you push the envelope and trying your best!
Good luck and I hope to see more of your work online