Your style is to die for! I have looked at many of your other HP covers and scenes and I say congratz! These are awesome! Did you look through the books for scenes and then drew them out on how the book described them?
First and foremost I must say a thank you for all the kind words and compliments on my art. I'm so glad you are enjoying it. As to your question - essentially, yes, I try and pick my scenes directly from the pages of the books. Some times I'll take slight artistic license, but for the most part I like to think of my illustrations as a snap shot of the moment it's happening.