if you look at the guys arm then you can see a cut out line accross the image, inbetween the fingers is a little left over dirt too. easy to erase and it cleans up your work a lot the idea of your work is good . You have to add the links to your sources in the right place for it.

If you go to the tab above that reads "my stuff" then you can go to "my contest entries" there you will see your entry appear and you can edit your entry. there are apointed places where you should put the source link. this link needs to be a link to the image where the author and possible the info on usage. No problem with your english, but i dont speak portuguese. If you speak spanish then perhaps ask mqtrf to translate some stuff for you. Here is his profile, hes a moderator on this site so a trustworthy source. http://www.pxleyes.com/profile/mqtrf/

Edit: I've corrected the image sources problem, sorry for the mix up