super cool dude! I like it!
I rated it 4 before realizing you did it in 25 minutes! Wow , this is great. Couldn't imagine how it'd look if you spent a couple of hours on it.
This is an impressive piece especially with the time limit given. I think that if this was worked on for an hour or two it would look absolutely stunning. and I am by no means any sort of art expert but I still know some talent when I see it. :D
For the time you were given, this came out pretty good. The lighting is really astounding. That being said, the anatomy in the face is kinda... off, and definitely needs a little work. Overall though, great work!