Your work throughout this lesson is exceptionally well done. There are a few minor issues I want to address, but as a whole your work here is very strong.

Starting with your arrows, these flow very well through space and capture a strong sense of depth in how foreshortening is applied to the negative space in between the zigzagging sections. You carry that sense of fluidity over into your leaves, where you capture a strong impression of not only how they sit in 3D space, but also how they move through the space they occupy from moment to moment. You've also adhered closely to the principles of construction in how you use the previous phase of construction's edge as a direct support when adding more complex edge detail - not seeking to replace that edge, but rather modifying it only where required.

The only major mistake I'm noticing is in your branches, really - here you don't quite extend your segments fully halfway towards the next ellipse in a consistent manner, often only extending them a little bit past the previous ellipse. This overlap is an important element of how we achieve a smooth, seamless transition from segment to segment, by using the last chunk of the previous one as a runway to overlap directly before the next one shoots off towards its own target. You can see this demonstrated here. This comes up here and there in your plant constructions, resulting in somewhat less solid branch and stem structures, so be sure to keep an eye on it.

Throughout your plant constructions you've otherwise demonstrated an excellent grasp of how each complex object is at its core a combination of simple, solid forms. By laying down that scaffolding and building up greater complexity through the addition of further simple forms, you've achieved considerable complexity throughout your constructions while maintaining a strong sense of solidity and believability.

I genuinely only have one issue with your work, and it is not actually related to the core principles of the lesson, more a simple rule for this course: as explained here in lesson 2, you should not be getting into any form shading with your drawings. Your filled areas of solid black should be reserved exclusively for cast shadow shapes. It is not uncommon for students to get into form shading unintentionally, often when they get a little more preoccupied with making their drawings look impressive and detailed, rather than focusing on our primary goal: communication.

With construction, we communicate to the viewer what it's like to manipulate the object in their hands. With texture, we communicate to the viewer what it's like to run their fingers over the various surfaces of the object. Texture is captured as a series of cast shadows of the textural forms, but shading itself doesn't actually contribute to either of these. So it's important to remember that where cast shadows are where one form blocks the light from reaching another surface - the shadow shape falls on this secondary surface, creating a relationship between it and the original form, by way of the light source.

Form shading however involves just one form, and the light source, with the form's surface getting lighter or darker based on whether it is turned towards or away from the light source. This usually results in a smoother transition, which will often result in students reaching for hatching techniques. So as a rule, leave hatching alone with approaching the drawings for this course (although admittedly you only attempted to use it once).

Oh, as one other very minor point - when drawing anything cylindrical, such as flower pots that involve several ellipses to be aligned together, always construct it around a central minor axis line.

Aside from that, you're doing an excellent job. I'll go ahead and mark this lesson as complete.