Arrows

Arrows flow pretty well, good confident lines. There are a few issues:

First is hatching, be sure you don't rush it, it has fraying on both ends, so make sure that you place your pen carefully at the corner of the arrow before drawing each line.

Second is the arrows themselves; they should be compressing as they get farther away from the viewer as explained here.

There are a few places where you don't overlap the curves, as rightmost arrow on the first page, so try to keep an eye of that too.

Leaves

They are a bit stiff, don't forget that just like in arrows, you should be prioritizing confidence over accuracy on your lines. Be sure you're ghosting every mark, as well as the little identations on the sides of the leaves. Remember as well that you shouldn't be cutting into your forms if you can, so try to avoid it as much as you can.

Branches

On branches you're mainly doing a good job, just a few things.

-The sides of the arrows should be drawn on segments, drawing them confidenly, ghosting and overlapping with previous lines. As explained here .

Plants

Good attempt overall! I'll go over the issues I can find so you can keep working on them.

-First issue I find is that you aren't making issue of an axis to allign the ellipses in some cases, as in your pots, or in the mushroom. Draw the minor axis for the ellipses will help you to allign them, so don't forget to draw it.

-Second issue is the one I mentioned already with the arrows, so won't go in depht with it.

-Third is texture; when attempting it you can only draw cast shadows, never outline forms as you did on the cactus or on the mushroom, give a reread to lesson 2 texture section, videos are pretty useful too so give them a watch as well if it isn't clear.

-Pointed out some issues in your third plant

-They have the main issues you repeat through all of your drawings, so I will only add this one more to cover that covers other issue I've been able to find.

And like I said, good job! Normaly step would be lesson 4, but as I can see you've already finished it. I'll try to go over your other submissions as soon as I can (excepting the wheel challenge as I've not finished it yet myself).