Pic 1) Some quick helmet ideas thrown out in about 40min. I'm pretty happy with how some of these look so I may try and incorporate them into my sci-fi work that I've done. Pic 2) Expanding from the helmets into the full suits of armor. I spent around an hour and a half on these.
I spent right at 5 hours on this, trying to crank out some animal warriors for some fun. I really like how the turtle, elk, and rhino turned out so I may do some expanding on those characters.