First of all - we have all been there or are there with you! So no worries and for sure don't feel embarrassed. Those quick poses are not easy! I'd say that 30-second ones are the hardest. I am struggling with them as well, but I can tell you what helped me a bit, maybe it will help you too - I am focusing on two things only - an angle between the pelvis and the torso and the angle between the torso and the head. Hands and legs are way less important (I recommend Love Life drawing video about this you can find it on YouTube) - After a finished session of quick catches ( around 20 minutes) I go through them slowly and try to analyse them, but not focusing on what is wrong but on what I could do differently to make it look better. Then I try to test this idea, and just redraw the thing or if I am feeling last (almost always) draw on top of the drawing. If it looks better - awesome. I note down what I learned. If I have no idea how to fix my drawing - I try not to get upset - some poses are just hard and I am on the beginning on a journey, some day I will get there. - A bit of cheating, but I am not doing 30 sec. at all i do 1 minute - cause its more beginner-friendly while still requiring you to work fast and not overthink