Ironhide's final design doesn't actually differ too much from his concept art, at least not from any that I've seen, but the design team had alot less time to work on his figure as he wasn't a part of the original cast. Arcee was supposed to be the 5th Autobot and was included in the original script drafts and concept art, but was removed prior to the script being finalized due to the writers not wanting to have to explain robot gender on-screen, as well as Bay thinking she was too small. HasTak however began working on the figures before this happened, hence why her deluxe figure is actually pretty close to the concept art, and why she appears so prominently in the IDW tie in comics (Ironhide is nowhere to be seen at all in IDW Movie Prequel IIRC, but Arcee has a pretty notable part set on Cybertron with Bumblebee.

Although I'm ultimately glad we got Ironhide in TF1, it's a shame we never got to see Arcee's original design on screen as it's actually one of my favourites from across the movies, and is certainly better than the ROTF design,which ironically appears to be just as small and with no gender clarification anyway... and two ugly step-sisters to boot.

 

(I know what 4Chan is, I'll just never pass up an opportunity to use this gif)

 

Barricade is almost perfect. It’s just missing a 643 on the front of the vehicle. Left bumper side 

 

Whats wrong with his mouth?