Here is the list on characters that i have finished drawing:

Bumblebee (animated)

Cliffjumper (tf prime, and g1)

Gears

Windcharger

Huffer

Brawn (Bumblebee)

Beachcomber

Warpath (DOTM video game and G1)

Cosmos

Seaspray

Powerglide

Outback

Swerve

Hubcap

Bumper

And yes I also added Wheelie (ROTF), Brains (DOTM), and Sqweeks (TLK) from the live action movies

There is the last character that will soon be add to the illustration:

Tailgate (featuring Cyclonus)

Pipes (before being stomped by overlord)