Hello , i'll do what i can to critique your work

1: Arrows

I don't have much to say for these as they are flowy , but be sure to draw the arrows with confident strokes , i noticed you stopped a lot and retraced your lines.

2: LEAVES

You've done really well on making the leaves flow!

In regards to textures , be sure that you don't draw as single lines, as you see here , it's be best to draw the shadow shapes to create textures

You made them overlap quite a lot which is great, i also think you did really well with the leaves' edges , you prevented zigzagging and drew each bump by itself, you could probably benefit from drawing "additionally" (ie: draw the bumps outside of your outline , not inside) so be sure to vary it when you draw more leaves!

3: BRANCHES These are really good , but i noticed that you did skip some steps in a couple of them , be sure to ghost your line so it moves past the second ellipse and halfway throught the third as it says on this page .

that said, you did improve a lot when moving on to the actual plant constructions' branches so it's hardly a problem , just remember it if you do warmups.

4: PLANTS

These are good! there's a couple things that stood out however.

First of all i noticed that you drew your textures as single lines and/or outline entire forms (like in this cactus ) , be sure that , as in the leaves exercise, you only draw the shadow shapes themselves.

this is a minor thing but always be sure to give some width/variation to any line, i mean this specifically for this plant's "hairs" , it's very easy for single lines to break the illusion of 3D, this also goes for most textures.

I did see that you've already finished drawabox apparently , i was writing the critique and didn't check first but i still hope this helps in some way, i still think aside from some textures (which are optional) you passed quite easily.