This is very impressive for a first try! I can definitely tell it's sonic there, and the colors you picked out were very nice. My only suggestion is to somehow find a better contrast between the subject (sonic in this case) and the background. If you look at the middle, the blues kind of blend between the water and sonics head. And also the background uses somewhat lighter colors, but towards the top you have these darker mountain colors that kind of clash and kind of separate from both the subject and background. But other than that, I think this is really good! Keep up the awesome work :)