Very very impressive lineart. I think it will look even better when it is done. Is this how the main character gets his powers? Is your friend Cesar really influenced by DC and Marvel comics? I don't mean to presume but that is the impression I am getting.
I was also what school your friend Cesar went to or if all this is self taught if you don't mind my asking?
Pretty cool character Not bad on the comic panels. It like building a comic book portfolio. Doing stuff like that helps get you in the industry. My critique is that with your character, that is colored, you need to space out the eyes away from each other and work on your hatching and cross hatching techniques. Try looking at some Escher for some inspiration. The upper leg that's facing towards us looks kinda messed up, add a foot there, and bring out the chest a bit more.
Isn't it his character? Even so, I think it's best if one person know, then all would know if it's passed down. You know, to take under consideration. He says that he has a friend in Brazil, he could go to Ed Benes Studio.