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hi, sorry for the long wait, so there are a few things that i missed that somebody pointed out:

for the leaves, i made an honest mistake and it slipped away from my mind; so the tropical palm that i worked from simple to complex was additive, but when i applied the edges/ drew the edges to form the negative spaces became subtractive because i disregarded the construction of the leaf, so keep in mind that we should be constructing additively and not subtractively(don't disregard anything, just build everything on top of each other.)

another thing is that when doing leaf edges is that when it's somehow very complex, instead of one complicated stroke, you can also just make it into simpler, more manageable strokes.

for the branches you seem to have a hard time aligning the ellipses onto the minor axis, you can ghost as much as you want and use dots to your advantage to better plan your ellipse's allignment.

now onto the critique of your revisions:

for the leaves i can see that you aren't zigzagging your edges, however there's a case where you're working subtractively rather than additively, especially when you're working on edges.

another thing to point out is that you've outlined your leaf veins rather than focusing on implying the cast shadow of the leaf vein, if you look closely at the leaf vein you'll be able to see that there'd be some shadows that it's casting upon: https://www.plantsnap.com/wp-content/uploads/2018/06/leaves-3420078_1280.jpg

for your branches:

there's still some occurences wherein the edges don't transition smoothly like branch number 10,3,12. do the flow lines first before constructing your branches since in some branches it seems like you first constructed your branches(ellipse then connecting it) before the flow line, it wouldn't hurt to ghost the flow line.

for your plants:

there's a lot of repeating lines for the branches and the leaves, or it may have been an attempt in adding lineweight, nevertheless, when you make a mistake always stick with it, don't try to hide it/correct it since you won't learn from it or would just make it work.

the rafflesia plant was a good attempt, one thing that could've better emphasized the solidity of the construction is by adding contour curves in the center of it like this: https://cdn.discordapp.com/attachments/814676072649719808/995905929935589477/unknown.png you could also add lineweight to define which is in front and which is at the back.

for the flowers, you've done great creating the initial structures of the plants, although the problem is that there are times where your leaves aren't clearly defined; for parts where it can't clearly be seen, try to guesstimate the structure behind it and not just draw it based from what you saw(https://cdn.discordapp.com/attachments/814676072649719808/995915983543873606/unknown.png).

there's still some problems with the branches as it's not transitioning quite smoothly and there are still some sharp edges that's present.

so i gave the daisy a go and here's my step by step process: https://cdn.discordapp.com/attachments/814676072649719808/995912622803271751/unknown.png

for the cactus. instead of drawing the actual silhouette of the cactus you can instead just draw a ball, or a branch that goes smaller and smaller to make it more believable, remember that we're tasked to break down the reference from complex to simple: https://cdn.discordapp.com/attachments/814676072649719808/995922308231348335/unknown.png

for the mushrooms you seem to be trying to replicate the underside of the mushroom which is daunting to replicate, so if you don't want to capture the texture you can instead encompass it into a form like this image here: https://cdn.discordapp.com/attachments/814676072649719808/995931015505780816/unknown.png

overall, there are still somethings that i want you to learn from so i'll only be giving you the exercises for branches and leaves since there are somethings that you still seem to be confused at.

branches:

• make sure to make the edges connect and transition smoothly, it's fine if there are some feathering as long as you are able to make it transition smoothly, that's fine

• align the ellipse on the minor axis

• apply degree shift for ellipses

• maintain consistent width for each ellipses(optional)

https://cdn.discordapp.com/attachments/814676072649719808/995933285161115648/unknown.png

leaves:

• make sure to not outline the leaf veins(if ever you want to copy the leaf veins, make it as a texture and only focus on it's cast shadow)

• don't zigzag your edges.

• work additively, instead of subtractively

• don't do a complicated edge in one stroke, break it into smaller simpler strokes: https://cdn.discordapp.com/attachments/814676072649719808/995935937009819678/unknown.png

forgot to add ref photos, my bad https://imgur.com/a/r1pxB3e