its all good man, the scaling (except biceps and forearms) are perfect, specially the helmets
i have a few reccomendations, for starters, redo them, i noticed ALOT of problems and mistakes, dont worry, it happens to everybody on pep, but redoing them may get them better because you learnt from your mistakes, and do HD, better results, MUCH better results,
last reccomendation, use the Hot-Card method, originated from hot-glue, basically hot glue loads of little pieces of carboard to the inside, so you cant see the inside at al, just lots of cardboard, then go over it with a thick coat of hot-glue, i tried it and mines harder than fibreglass, its an amazing technique, anyway
your pieces are looking great, so keep it up, ive even bookmarked this topic ^^