In your arrows, I notice that they are a little stiff. If necessary, you should ghost more, draw freely. I'd recommend to shrink the farther end a little more, too.

However, the leaves, in my opinion, looks nice.

I admit that the branches exercise -at least, for me- is a difficult exercise. I see a lot of "chicken scratch". So, although I struggled to much with that exercise, maybe ghosting more will help? And changing the page position can help, too.

I think that -and to put it buntly- overall, all your construction look weak. That is, you didn't ghosted enough to mantain a solid form, which is the base if the entire drawing. And I think you focused too much on deatil. Although the demos have detail, you should avoid the detail in the first 4 pages.

For example, in your "Sanseviera snake plant", in the pot, you added too many contour lines. I think that they don't convey enough roundness. Remember that sometimes just one or two well drawn lines -that serve it's purpose- can make a way better job that a group of bad made ones. Keep that in mind, is important, since we're relying on solid shapes to convey 3d.

Another thing I noticed: you didn't draw through your pots, and that sustracts a lot of support from your drawing. Although they may seen like a lot of leaves coming from anywhere, they have their reason to be -perhaps they come form a core, a bulk, a branch, i don't know-. Cause that you shall observe enough to give support to your drawing.

And you shall construct additively. Base all your movements in 3d, reliable forms. Think in the best approach for your drawing.

Once you have a good, well cimented construction, your detail will shine. You need to focus on construction.

And some lines look wobbly, that's the importance of ghosting. Do it always.

So, this is just my opinion, and sorry for bad english