Personally I think this is the best out of all your artwork. I love not only the style of your artwork, but wish to practise and learn more ideas from your work. This is as you can see, my favourite one out of all of them. I also, for some reason, like the pose of the demon figure. Basic, but shows off a little on how he looks, like he's proud. What I do also love is your shading, fits perfectly on the jeans, sweater and around the face. The background is plain, but shouldn't effect the drawing in anyway and it honestly does not. Nothing really needs to be improved, and I can see it looks basic due to your original art style which won't bring any points down towards my vote, because I can only say I love your style. I hope to learn a few tips and pointers from your artwork, and I'll be sure to look more into using some as references for future projects.
Judging by how much I really like this doodle up, I'm of course rating this a five out of five in both scoreboards I guess you can call them. I'd love to see more of your art and learn from them.