Model Sheets and More

I was trying to decide what body time would best fit Duncan. After some thought and looking up the 3

different types, I went with the "Mesomorph". I wanted Duncan to look young, but not scrawny, I didnt want him to look like a knucklehead either, so I though Mesomorph would be the way to go.
I was alsowondering what sort of prop I could give him. Since he is a mechanic I wanted him to have some sort of tool, but a tool that gave off a threatening vibe as well.

I feel like there's something wrong with the side view? but I can't put my finger on it.

Model sheets are always challenging for me, since I like working on looser sketches .
I hope I can get enough practice so that these are less challenging and more of a second nature to me.

The most fun part! Attitude, sketches, emotion, personality.

I couldn't help putting dialogue on a few of them, I have always wanted to do a comic, and as I drew these  though of fun little scenarios for Duncan.

What do you think?
Thanks for reading!