Hey, @mathews, nice drawings! The struggle is understandable, this is a challenging exercise. But keep going on! Mostly, what I see is that your drawings have a lot more visual information than just Lower Back muscles, and adding this much stuff may be scattering your attention throughout the process. So, since this is a Lower Back muscle assignment, I’d suggest simply overlooking everything else in order to focus more sharply on the lower back. I agree with @axel21's suggestion about following the order “gesture > bones > muscles” for the drawing process. Aiming to track the origins and insertions of each muscle should also really benefit your practice in this type of anatomy study. I’m attaching an attempt of my own on one of the poses you did, hope it can serve as a visual complement to this feedback. If you have any questions, please feel free to let me know. And feel free to get in touch whenever you need help. Best of luck in your studies!

Hi mathews. I really like how the lines flow, and the figures feel alive. I think that the only stiffness I see is on the pelvis on the seventh drawing. Proportions seem good too! I think that if you start with the gesture, the arms and legs will feel more natural, like the rest of the body. Also, it doesn't feel like the muscles attach to bones. I would suggest to try to draw the bones after the gesture, and try to map the origins and insertions of the muscles to the bones. Finally, try to have different kinds of lines (not the same curve in repetition). For example, on the third drawing, you drew the upper arm with four identical curves (from nech to elbow). I would suggest to have more straights and angles, so that the forms look more natural and solid. Good luck in your anatomy studies!

Whoaaaa great job! :D I feel maybe sometimes you draw the erector spinae and the lats a liiiiiiiittle bit too bumpy -- but I'm just nitpicking, so don't take me too seriously! This is really outstanding work, and I think your mastery of the back muscles is really really solid.

Sorry I don't have any constructive criticism but just want to say this is really good! Really inspiring work!