ref photos

I think there are some nicely done curved lines and motions in some of your gestures, specifically with the legs and torso. Originally I was going to say I'd like to see what your gestures are like with more time and thought put into them but I can see you posted more below. You had asked about proportions and I kind of wonder if at this point its something worth dwelling on. I think you could use some more time into the actual gestures first as some of the figures seem to lack a little confidence in the lines (a lot of reworking the lines) or the curves themselves seem to lack a little bit of fluidness that your 30 sec gestures have.

Hey there! You are doing well for firt try. But I can tell what is your problem is. İt's a form and perspective issue. Loomis head is basically a combination of a box and a sphere. I'm talking about a box, really. And this important because in your drawing, you don't really give the sense of a 3D shape, it looks like a bunch of line floating in the air. You have to develop your sense of 3D space, shapes and perspective drawing skills. I have couple of exercise that you can do in a daily basis.  First of all, draw a sphere, and think about that sphere has lines around of it. Draw these lines. Do this over and over again until you became comfortable about it. And with that, draw boxes from any angle. Proko has a video about it. Check it out. This will help you to draw in perspective. Secondly, draw the Loomis head but instead of using spheres, use boxes. I dropped an example for that in the below. This will help you to understand the 3D'ness of the head. Last but not least, draw the Loomis head. Practice makes perfect at all. And by the way, you must do this exercises over and over again. This is not something to be done on the first try. Lastly, I'll put some 3D models can help you. Don't rely on them please, they are only tools but you are the one that has skills. https://sketchfab.com/3d-models/loomis-head-d0b3f4aa633a44d8bda8cfe2f779f1f8 https://sketchfab.com/3d-models/andrew-loomis-head-d2020b07408b4f238004f04d082a3193 (English is not my native language, so if there is something you don't understand, tell me.) Good work:)