Arrows

They're looking good, but they have a few issues:

-They are mainly working in the 2 dimensions of the paper, as they don't get closer towards the viewer. To create the illusion of depth, you need to make both the space between folds, and the arrows themselves grow and get bigger as they get closer towards the viewer.

-Another thing is line confidence. Some of your lines are a bit wobly, so don't forget to ghost your lines, and to focus on confidence over accuracy.

-And lastly lineweight, you can add it to the parts of the arrows that overlap to clarify them.

Leaves

Leaves look good in general, just keep in mind you should be always working additively if you can (you've cut into the form of the bottom left leaf).

Branches

Branches look good too, but two things:

First is that the ellipses don't shift much. Keep in mind that even if the branches are straight, the relationship between that part of the branch and the viewer will change, and because of that the degrees of the ellipses need to change as well.

And second is the visible tails, one thing you can do to get the transition smoother is to overlap the lines with the previous ones more, like on the superimposed lines exercise. An example here.

Plants

On plants I think you're doing a solid job overall, but once again, I'll point out the issues I can find so you can keep improving:

-About textures, there are some places where you're approaching them by scribbling a bit. Keep in mind that all the textures you do on drawabox need to be done by using lesson 2 techniques, so every mark you do must be done by first looking at the reference and carefully copying it, as well as only drawing cast shadows. Which is why you should never scribble.

-Next is breaking everything into as much steps as you can, I made an example on this drawing, (added the texture thing too), but there are other similar things in other drawings as well, so try to be more careful with this in the future.

-About ellipses, in general there are lots of times when you don't draw through them 2 times. Don't forget that you should always do it, no matter how small the ellipses are.

I've also noticed you tend to have trouble when alligning the ellipses to the minor axis; a thing you that can help is to find first the distance of the major axis and place dots on the ends of it, which will make the ghosting of the ellipse more accurate.

And another thing more about ellipses is the degrees. On the pots you tend to make the bottom ellipse with a narrower degree than the top; in reality, this is the opposite. As the bottom ellipse is facing more towards the viewer, the viewer will see a wider ellipse on its. Here's an example with two coins. (As a pot is basically a cylinder)

Some of the leaves look a bit flat too, it's a bit hard to tell with the reference, but try to pay more attention about how they behave as 3d objects in general.

And last thing I can notice is the branches, which I explained already in the branch section.

Good job overall! Keep up the good work and good luck on lesson 4!