For texture doing the 25 texture challenge is sure to increase your skills there.

https://drawabox.com/lesson/25textures

I will give the best critique I can here

Some of your branch forms , it looks like you did not take enough time to ghost them. A good number look rushed. They are thick where they should not be. Take your time with them. Remember you draw circle to circle, line by line to get accuracy. Some of yours seem like you just drew one line.

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

Some leaves look rushed as well. I think thats the problem it seems you rushed a lot lines here. Some lines you also drew over, draw just one line unless you are showing that it overlaps another.

I will ask for rivision, a page of branches, take your time please.