very cool lil, keep it up! kiss roks pantera my fave!

Hi ! Lil thanks for your comment. Well about your questions, first I draw it using vectors in Illustrator and then I used Photoshop. To submit your artwork at first you need to log
on the page, and they are going to tell you which resolution you have to use. I hope that this info will help you with your uploading.
If you want to know more about different techniques of illustrations, sometimes I upload the process into my blog. You can check it out at http://eliasvillagomez.blogspot.com/