While reading through your description I could really relate cause I struggle with almost all those things as well haha.

I think your plants are very clear and read easily. Except for the second one, none of them feel cluttered at all so good job. (and the second one isn't even bad, just busy).

As someone who still stuggles with line confidence myself the best advice I have is: before you start a drawing, give yourself a goal. Goals are great to have because they give the drawing purpose and it's easier to know if you failed or succeeded. So maybe before drawing some plants you set out with the primary goal of having line confidence and moving the pen with your entire shoulder. Watching Uncomfortable draw and the pace in which he puts out his lines in the videos from lesson 1 really helped me get a better grasp as well.

I feel the shadows can sometimes be really confusing, especially if they're cast on an object that's a bit further away. In the same drawing some shadows say that the light source is straight above and some say the light source is above and to the right. The shadows don't always follow the form of the object it's on either or look like the shape that's casting the shadow. But it's very hard and I think for this reason Uncomfortable only really draws shadows on forms that are close to each other, they're not really meant to convey accurate light and shadow, but rather to make a clear drawing and seperate forms from each other.

But ultimately I think your end product is very impressive and you plants look great. I think you picked a good variety of plants but still managed to excute it. I especially love the flower with the thorns. Very cute.

Hope this helps. :D