I think you drew your arrows with enough confidence. The only thing I recommend is to shrink the farther end more, and do the nearest bigger. Overall they are flowing, which is excellent, but is some of them there's poor espaciating, which sometimes can break the illusion of 3d. Keep that in mind!

Now, with your leaves, I see wobble there. Remember to ghost enough so that you can execute a confident stroke. Some leaves aren't enough flowy. The ones that do not have nothing (nor contour lines nor texture) could bent more naturally. Think of them like arrows: they overlap and bent, the difference is that instead copying the initial line (spine) you copy it twice. Give this notes a read to a fresh recall:

https://drawabox.com/lesson/3/2/flowline

However, the biggest issue I see you have is with what you add to the leave. With this I mean texture and contour lines. Some contour lines are sloppy, like added in a rush. When you put down contour lines, you have to think on how they help your illusion.

Regarding texture, you drew ignoring the confidence rule: they have more than one stroke, and aren't confident. Even is it's just texture, you shouldn't forget about markmaking rules:

-https://drawabox.com/lesson/1/2/continuous

Remember that texture is not that important; what matters is to be able to draw a nice, confident leave.

As you said, you definitely need to work on ellipses. First of, you need to draw them confidently. For doing that, you need to use the ghosting method, you need to let your muscle learn the movement, and execute it with confidence. Also, remember to always remark them two times at least, which is something you didn't do in most of your work.

Please re-read these notes:

https://drawabox.com/lesson/1/11/drawingthrough

The branches themselves do not have chicken-scrath, which is nice. But in some I don't see overlap of lines (if you did, then actually is excellent), but if you didn't, remember to do not actually just draw them in one single stroke, bacause it miscontrols. The important point here is to do it (yes yes yes I repeat myself) with no wobbles.

Moving into your constructions:

In the petals of your first photo's plants (Eriostemont, etc.), the leaves aren't meeting with its respective spine. What I mean: you the the spine, then the other lines that will conform the leaves, but you actually ended them farther than the spine, and I don't recommend doing such thing. Remember that the spine is the most imporant part of the leave, since it conveys how the leave flows through 3d space, and if you ignore it, your leave will look flat. And yeah, you draw the petals in the same way that leaves.

In the Eriostemon? (however you spell it), because you drew a wobbly ellipse, didn't support it with any other form or contour line, and drew the petals ignoring the basic spine, you ended up flatenning your entire drawing, which shows the importance of drawing with confidence, employing 3d forms and making sure that everything in your drawing is solid.

In the Epacris longiflora, there's no a definite place from where the leaves are coming from. Remember that you should expend some time understanding your subject. Nothing is coming from anywhere.

That goes for all your drawings: because you forgot about confident lines, ellipses and solid 3d forms, you ended up flatenning your drawings. (Although I shall recognice that in some of your mushrooms you really showed the relation between the forms, good job!)

I am not an expert, but I think you should re-read the former lessons, and this one as well. Do not estress just because I said that you had a lot of mistakes. It's better to have a nice base, instead of cotinue trying to cover those fails. Never go ahead unless you have at least 1 critique. Critiques -or critiquers- are very helpful, since they tell you what you did wrong, based on their own experiences, and can tell you how to get better.

Please stay determinated, be positive, and do not get discouraged.