Nice work! It seems you are already getting the fundamentals pretty well. Perspective in particular can be very challenging.
I noted others already provided the same points I was about to mention, so it seems I don't have much else to add, except that it seems like your lines have been getting progressively more "clear", like there's more confidence in doing a line in one go instead of slowly building the drawing through different strokes.
That's a piece of advice I personally have found very helpful, when making lines, especially digitally, it's ok to do a single confident stroke instead of "several strokes". You can always undo and redo the stroke as many times as necessary until you get the "right line". Eventually it helps create cleaner lineart for the rest of the drawing. Hopefully that makes sense.
Your figure drawings in particularly are showing this, that is, more confident strokes, which is great.
