good amount of detail and shading. but i noticed with your humans that their a bit... bulky? xD. not as if they're fat, they're just wider than they should be. also, at the girl, she has a more... erm... masculine figure that needs to be fixed. generally if you're a guy drawing a girl, it's hard to get the anatomy of a girl down. don't be afraid to look at references online if you're confused. just make sure you're not tracing anything. :3 it also helps if you get a mannequin for human anatomy.
Unfortunately that pink person's a girl, I can't draw girls not masculine for some reason o_o;; Lol
I used to be able to draw females like anime characters look like. I seriously don't get what happened... lol, I should look at references, you're right, I think the reason I stopped drawing girls like I used to is because I want them to look more real. However, I got the opposite effect lol. I should really look at references. I need a manniquin too. :<
A good place to get references is posemaniacs.com (or posemaniac.com or something like that, I don't remember the exact name) but it'll show you the human body with muscles so you can learn structure as well as make it realistic. What's also cool about it is that you can rotate the poses all like 360 degrees in 3D space so it's really useful to help you understand form <3
Your stuff is pretty cool! I would just say to work on line of action, proportions, and just keep drawing! You have a really nice style!
You're definitely super talented! :3 So far, the main things I'd recommend are working on your outlines (perhaps tapering them, where the line gets thinner where it comes to an end? makes outlines look much cleaner) and, as suggested, proportions. I love your vibrant colors and my favorite of your images is definitely the second (from the left) picture of Ray (?) in the image with Ray and Marshall.