Hi there! Love getting to check out other folks work - I can pass on a couple of critiques that I'd received from the DrawABox teachers, and which I can see are relevant to your work as well (solidarity...) - in your initial arrows exercise, I can see that you are doing a good job of keeping the width of your arrows consistent. BUT, with the goal in mind of creating the illusion of perspective, you might experiment with some foreshortening - making your arrows get thinner/smaller as they move back in space. This section from the original Arrows exercise explains it better than I can

Likewise, when you get into your leaves and plants, you're doing something that I also got dinged in my critique - laying down an initial guideline, then deviating from that initial guideline when drawing in the form and detail. You can see an example on your first page of leaves (the second image in your gallery) - you've got a clear guideline for the leaf on the upper left corner of your page, but when you went in to draw the individual lobes of the leaf, they extend beyond that initial guideline. The goal is to be very intentional when laying down that initial guideline, and then commit to it when you're filling in the details (OR, intentionally add forms onto that guideline which extend it, rather than just drawing the new forms over it). This section of the Leaves Exercise covers it well - you want to build off of the original guideline/form, rather than weave in and around it. I was doing the same thing, but when I went back and did it over (after being corrected!), I found that being intentional about the guideline made me concentrate harder on drawing the guideline more exactly, which had the effect of better training my eye and my hand.

Happy drawing!