Why So Angry? Sketch

This is the sketch I made in Photoshop Elements for the lineart I did here: [link]

I'm totally new at doing digital art, but I love it! One thing I learned though, is to really make sure the sketch is detailed and accurate before jumping to the lineart. I got too impatient, and if you compare the two, you'll see I had to make a lot of adjustments while I was working on the Lineart because I wasn't careful enough in the sketch. Hopefully I won't repeat my mistakes?

I referenced this great photo [link] by Marcus Ranum `mjranum-stock