Very good job!
Artwork like this can become blurred or otherwise hard to recognize, but this is easily recognizable as Tom Hiddleston. The Avengers hat was a very nice touch, as it provides a reminder to what he has acted in recently. Even the facial expression and smile were perfect! No small feat there, so kudos to you!

My one issue with this piece is that his hair is somehow off. It's naturally curly and not as...gravity-defying, but since Loki's hair was like that, it kind of makes sense. His hair really depends on context.

Great job overall! One of my favorite paintings of him!