Very simple use of colors, but the overall concept and presentation is well executed. It is clear this character is going to a concert and is a fan; he possesses all the looks and attire of someone ready to rock out and have a good time. The detail in his neck is especially good, and gives his alien/reptilian appearance more believability and texture. I'm not sure of what the object next to him is; it may be a door, a portal or some sort something else; it's ambiguous. The mask or head in the upper right corner, though, is a nice touch, and is in keeping with the theme. I would have liked to see more detail in his markings or tattoos, but its not entirely necessary, and too much detail would have thrown the technique off balance.
Its a highly stylized piece, mixed with some abstract elements. I'm not used to seeing this kind of art, so it was quite refreshing.