Sweet! that HotRod design (or is it Rodimus) looks particularly funky! And I really like Magnus' design and the angular blocki-ness of it. The other guys look cool too, although I'm only able to recognize a handful of 'em. Is that Cyclonus to the right? Love those thigh-panels. All of these designs have individual personality, I really like it!
Your colors unite these characters, but give enough variance to separate them and give each one their own dynamic look. So often we colorists do our individual designs/colors , but when we bring the characters together sometimes they don't have enough distinction/diversity, but that's clearly not a problem here. I think that's a combination of the unique personality in their designs and your color choices.