Starting off with the arrows section, I notice a tad bit of hesitation in the way you put down your strokes. There are tiny wobbles and your arrows bulge and narrow suddenly. Keep the increase in width consistent. Also note that the negative space between curves has to increase as the arrowhead reaches the viewer. This will improve as you go on, but this is how the line weight must be added: https://imgur.com/OHvr7Mb.

Your leaves have very nice fluidity to them. Remember not to add extra strokes that add no value to your drawings. I can see that you have gone over the strokes more than twice but that is unnecessary. When adding edge detail, you are working both additively and subtractively on the same side even when the curvature is minimal. I would recommend going over this: https://drawabox.com/lesson/3/2/exerciseleaves again. Also leaf texture is very complicated so if you're adding it, add it like this: https://drawabox.com/lesson/3/8/texture. All of this improves in the second page, but please keep it in mind. Every stroke you put down must be of value, so don't go over strokes multiple times.

Your branches are very smooth. There is no variation in your ellipses, think about how ellipses sit in 3D space and vary them accordingly. Also, try more curvy branches for your warm up when you're comfortable with your understanding of how ellipses vary.

In most of your plant constructions' leaves and petals you tend to use both additive and subtractive edge detail, stick to either additive or subtractive based on the basic curvature and flow of the leaf. When you're dealing with uneven branches, form a simple branch first and then cut it down. You can refer to the thumbnail of this https://drawabox.com/lesson/3/1/video for that. Most of your plant constructions look very good with the detail you've added, but it seems like you're avoiding the construction part of it. Your ellipses are way too wide on the fruits based on the angle of view, you used contour ellipses instead of drawing them through on the cactus. I would recommend you go through the first two lessons again and then do a few of these constructions.

In conclusion: the flow in your construction is good but its no use without your basic forms. Do the arrows, branches and leaves for your warm up. Include exercises from lesson 1 and 2. Put your strokes down with purpose and understanding of 3D space. Don't chicken-scratch. Use shadow shapes in texture, not lines https://imgur.com/M9JJfr4. Don't try to make your drawings pretty, just focus on line confidence and define your shapes.