Lovin' all the variety man Good stuff. And it's cool that you're expanding beyond the human form too! I need to do that more often OTL
Onto the crits!
-If you want to draw something but don't have a good feel for what it looks like get yourself a ref picture. It's not cheating.
-Sailor Mars' arm looks broken. I'm not sure if it's just a tangent in your lines or whatever but right where it pokes out below her skirt the angle seems weird to me.
-I'm seeing a reoccuring problem in the legs. Particularly in the knees. It kinda looks like there's the thighs and calfs but no joint due to how tight you're sinching in the area. Knees tend to be a rather thick and knobby joint and they bring a lot of form to the leg. Yes the knee area does get narrow when viewing a straight leg from the front but not quite so drasticly. Take a look at some photo refs and you'll see what I mean.