Wanted to upload one of my relatively neater doodle sheets. Starting from the upper left:
"Resartus" Helmet experiments; "Revenant" [scary version] for comparison [note arrows pointing to a generalized EVA-01 head]; Old Myling Helmet; [Bottom left] "Polis" garb for ERC-3; Random face/nightvision design I spotted off some guy's signature; AC223 rear quarter/side/front views.
Top fin-thing on the AC223 can pivot up and down.
Arrows were just areas I wanted to draw notice to for later review, but I decided against cleaning them off on the scan.