This is beautiful! Really great job on your first try! :). The only thing I would mention is to try to get the proportions of the eyes right - you can do that by comparing it to the other features of the face. Study the model a see how far below her eyes are from her forehead, space between eyebrow and eyes, things like that. I've found that that helps me a lot in trying to figure out how to proportion them correctly. And of course, like Stephen mentions, start super light, and that gives you space to adjust. Keep up the awesome work! And I hope this helps!

Nice style!