Hello, Sargentobigode:

Let's see what you could improve:

Arrows

You did well here. The common mistake was that some of your arrows had constant width so it's hard to believe the illusion of one end being deeper than the other. Also, you struggle following the path of the arrow in the second line you draw but this is normal. Your use of line weight was correct but I would go with a more subtle approach.

Shadow hatching was good but remember that this was an exception and hatching should never replace the contour of a properly drawn shadow.

Leaves

You did great here too! Flow lines are correctly followed (3rd on top and last on the bottom being the exceptions). You added forms to the silhouette correctly adding forms on top of the general form wrapping it around and you did it so subtly that is beautiful despite being an exercise. Texture and shadows were nice too.

Branches

Here is where I found where you most struggle with. Your branches have 2 main problems: you don't follow the main flow line correctly and your ellipses are not aligned enough. I recommend you start warming up with the funnels exercise (lesson 1) so you can practice aligning ellipses in a more controlled environment.

To add on top of that, the branches felt too plain. This is because the ellipses you draw were in most cases the same length (major axis) and the rotation (minor axis) is harder to notice when ellipses are misaligned.

Plants

I didn't see problems here that weren't mentioned before. I noticed that sometimes you draw wobbly lines, try to prioritize smoothness over precision. Accuracy will come with practice. Look at your 5th plant. The wobbliness at the bottom of the drawing rest all the good quality the flower could give.

Here you had the same problem with branches as before. I don't think you have to worry too much about it because seeing your mushrooms I notice that your details hide pretty well the bad branch behind it.

Verdict

You are ready to continue. You got the concepts of this section. Try to improve that branches and cylinder constructions. These are more organic forms and the cylinder challenge after lesson 5 will be centered around straight ones, so you have to practice those apart. I recommend you do warm-ups with organic forms and funnels exercise to work on it.

I hope my critique was helpful. Happy drawing!