Oh wow. That is so neat. ;__; I’m so glad I motivated you. Wow.
Oh! Okay, first off. Have you read about anatomy? Like, not just drawn bodies from reference, have you actually read about the muscles, how they work, the bones, all that in every single little detail? Even details that seem completely unncessesarry? Such as, “there is a small tendon (?) in this bone that stretches to that muscle but you can’t see it”, etc etc. If not. Do! I am not kidding, read about medical anatomy. You don’t have to learn about it, like it’s some sort of test or anything, but trust me, this will help with a lot of things that you would only dream of. I can’t explain it; I read it from a professional from a book I bought some years ago, I did it, and I learned so much. I got better within weeks.
Other than that, here is some basics how I tend to “build” my bodies! I tend to imagine them like ball jointed dolls, and shapes. Extremely simple example:
Tip: Overlay the shapes to get better “feel”. Do the shapes just how it feels right. It does not have to look good. This is the absolute basics, it’s supposed to be rough, and even silly. Don’t do it as solid as I did here. Do it rough, messy, playful. Dare to do mistakes. It’s the best tip I could give anyone. Dare to do mistakes. Now tell that to yourself out loud a couple of times until you got it.
However, a method I tend to use to get more movement is to draw a stick figure first. Remember that the figure, just like the one above, do it rough, quick, silly. Don’t be anatomically correct just yet. Do what feels right. Remember that with this stick figure you’ll have to feel the lines. Feel the movement. As you can see, my stick figure looks strange and wobbly. But…
See? The ball jointed shape doll thing is back, the one I talked about before. It doesn’t look like before, it’s cause I don’t follow any certain rules. I just do what feels right. Looks silly and incorrect still, but as you can see, I worked outside the stick figure. I am aware that this looks much less sketchier than I explained to you; it’s cause honestly, I’m not giving my 100% into this drawing of course, cause I’d like to continue on my gift for my friend. Tsk. xD Anywyway.
Ta-dah! See where I am going? Obviously this is not my best work, but still. I made changes, I fixed things. I didn’t follow the doll exactly; many tend to do this at the beginning, just don’t. The doll and the stick figure is just guide lines. Also, this is never my final sketch. All I usually repeat these steps a couple of times until it looks like I want. c:
Another thing, always give the hands and legs a purpose. Many tend to hide them or just have them hang there. Arms and legs tell a lot about the picture and the character. They have a much bigger impact on a picture than most think.
Another tip is; twist the body parts. Instead of having all body parts facing to the right; let them stretch to different directions. It will make the picture look interesting. Just make sure it looks natural though! Even if they’re doing advanced Yoga! xD If you don’t get what I mean, here’s a quickie?
Hopefully you understand. Hope this helped! I’m no professional, I still got plenty to learn myself. (: