There with insects I'm getting a little trouble with legs in particular - they are quite tricky to get right and when focusing on solid forms they turn out rather chunkier and much more awkward, not sure how to address that (for example with the spiders) and also about drawing through parts covered by rest of body - it didn't seem Uncomfortable draws them fully in the tutorials? So as you don't see them its hard to speculate either to be honest.

Another thing is wings - since they are flat, but have organic shapes (eg not square planes), how we should tackle them? Kinda having this association - organic form = solid 3d object which is not always the case.

Proportions are still hardest to get right and it requires too much strokes to convey the shapes properly or at least convincingly which distorts the subject sadly, and cast shadow in reality(judging from photo references) is super blurry and mostly non-existent due to light distribution, so not easy to convey too.