Hi, I'll be critiquing this lesson! First of all, congratulations on completing the lesson! Anyway, onto the critique :D

Organic Arrows

Your lines are confident and the hatch mark to indicate the drop shadow of the curves are spot on. However, your line weight looked a bit scratchy on the curvature, so I think it's something you could improve on the future :D Other than that, try different angel in the way the arrows are bended, since most of them felt like they are viewed from the top (like the most left one was drawn with an interesting angle).

Leaves

The leaves you draw are very detailed and sharp (literally). Most of the spikes felt like it would hurt to touch just from seeing it. The only feedback I have is with some of the smooth leaves like the one on the bottom right where the curvature felt like it had no impact on the shapes or the construction that the leaves are in 3D. This is in comparison with your other leaves. The texture are beautiful so I think you did a pretty good job.

Branches

I can see some lines are not connected and some of the tubes need to be redrawn with another set of line to make them connect. There ellipses also felt a bit too flat. What I mean flat is that when the ellipses should look a bit wider as they face the viewer and looked thinner as the look away from the viewer. I suggest looking at this guide to help you draw branches next time https://drawabox.com/lesson/2/5/ellipses

Plants Construction

I was honestly blown away by the overall quality of your plant constructions. Their lines are mostly confident. At first the edge had this zig zag elements and the lines had this shakiness, but by the time you reached the fourth one it was very clear that you are getting the hang out of it. I could see more confident on the way you draw plant 3 compared to plant 1! Don't get me on the texture and how real they feel, especially on the mushroom.

However, seems like you are having a bit of trouble drawing the branches as can be seen in images 4-6, where the branches felt flat in comparison to the rest of the drawing. I'm not quite sure if the changes in between each segment is intentional or not, but it feels like you ditched the suggested methods for a more cleaner looking lines at the cost of the line being confident.

Don't let this bog you down that much, the use of drop shadows and line weight has been super appropriate, especially the mushroom that shown of it's tiny little drop shadow bumps. The roses, one of the hardest plants that I remember tried drawing at free time, also looked beautiful and the amount of lines in there meant that you did a lot of planning. I'm really impressed.

In conclusion, I can see a lot of improvement throughout this lesson and I think you understood the things that these lessons are trying to achieve. I'm gonna ask you redo the one page of branches before moving on, but I think it wouldn't be a big deal with what you have accomplished!