This looks great, very realistic. I have to say, Arcee does look a little weird, but it's so difficult to find a decent source to draw her from that, whatever it is you did, came out spectacular. Transformers are very hard to draw because they have so much detail, but you did an excellent job. Both the lines and the colors look awesome.
It looks like they're all running from Optimus Prime.
Sam looks older and the jacket makes him look more like Mutt Williams from the fourth Indiana Jones film. And the way you did Mikaela's face makes her look black (African-American) or vaguely like Jennifer Lopez.