Hi!! I love this, its really good!
If I'd give you any critique, I'd probably tell you to look from behind in the paper (against the light) to check for any mistakes. Also you can probably try checking your drawing from a distance (like, tag it to a wall then back up like 4 steps) to see if the thumbnail is good!
these steps are really good for traditional artists (ofc there might be more current ones, these are what I used to do when I made traditional art lol) to check if there's something in your control that you can change~
Though I really like the way you use your materials as well!