I know you asked for some critiques of your artwork, so I figured I'd start with your main character ref!
First let me say this, and this applies to all of your character refs, I love the art style you made them in! It's just the right mix of detailed, but comic-like to work with a graphic novel! It's a great look you achieved!
Now on to the critique of the actual character! Dillon is a very rugged looking man! Knowing he is Irish in origin, I might guess he is Black Irish based on the way you drew him. (That may not have been what you were aiming for, but that's what it looks like to me!) His shifted forms have a very stern look in the face, like a man, er... wolf on a mission would have! The height proportions look good, as does the body shape for each shifted type. I also love the fur color choices!
Overall, Dillon is a great looking character, and I can't wait to see him be used in the comic!