OddCo - possible designs

Working on a commission that involves a few characters from *Demyrie's fic "Odd Couple". Do these guys look okay, or should I change something?

(Bulky's not in the picture I'm working on, but still, I felt like drawing him.)

Optimus's design is based on how he shows up in "Human Error", except here he's a little younger, like Demyrie's depiction of him. Bee is... Well, he's Bee. I know he's black in "Human Error". Be thankful I gave him green eyes instead of blue. And Bulkhead! Had to give him a funkeh mohawk because he's the tough guy of the group, even though he doesn't mean to be. (His bot mode has the mohawk, see? He's not always stressed, like he is on here.)

Transformers, Optimus Prime, Bumblebee, and Bulkhead (C) Hasbro/Takara
Odd Couple / Odd Moments (C) Demyrie