Congratulations on completing lesson 3! I will try to give you some feedback on your plant drawings.

Arrows

Great job on these. Your lines are smooth, and the arrows have good foreshortening. My only critique is to be more confident when adding line weight to the overlaps since they seem a little wobbly compared to the rest of your lines. Don't worry if they don't exactly follow the curve since this is meant to be practice.

Leaves

Your leaves have a nice variety of shapes and textures. However, try to construct your complex leaves out of simple shapes first. For example, I think you should've approached your maple leaf by first drawing basic leaf shapes around the stems and then adding complex edges on top like in this example: https://imgur.com/a/5fJIBAU, instead of just drawing the silhouette around the stems.

Branches

Great job on this exercise. Your ellipses are aligned well with the minor axis lines and the knots look solid.

Plants

You should definitely NOT feel bad about your plant drawings. As you said, the goal is not to make pretty drawings but to construct solid forms, and your plants do a great job of that. Your stems and branches have a good variation in the degrees of their ellipses which make them bend convincingly. I like how you put contour ellipses on your spherical surfaces, like with the blueberries and oranges. I also liked how you matched the contours of your forms with their silhouettes. For example, the ridges on this pumpkin match well with the bump in the outline: https://imgur.com/a/mavqSS3. Overall, great work!!