Those flowers are definitely moving in the right direction, and I'm really happy with how a lot of those petals have been drawn with confident, smoothly flowing lines. One thing to keep in mind though is that the ellipse you draw early on is meant to define the specific bounds of your construction - for many of these, it establishes how far out your petals are going to go.

Constructional drawing is all about making decisions step by step, one by one, in this manner. We make one decision (how far out will the petals go?) and then we adhere to it as we move forwards, rather than ignoring it or deciding to change that decision. Once it has been made, it cannot be changed, otherwise we'll end up with contradictions in our drawing.

Another way you can think about it is in terms of the scaffolding that holds up a building. While it is being constructed, we put up struts and supports, and what we build on top of them cannot overextend beyond where it is actually supported. Every phase of construction is similar - we lay out a structure, and then in the next phase we adhere to what the existing structure can hold up. Then that becomes the structure to support the next phase, and so on. So this flower in particular ended up with more complex edges that didn't quite follow the structure that preceded it that closely, resulting in a much weaker relationship from phase to phase.

As for the additional pages I assigned, they should be listed in orange just underneath my last critique, as shown here. If they aren't showing up, could you tell me what browser/device you're using to view the website? It could be a bug.

Lastly, I definitely agree that the approach you described - moving forward without thinking about what was covered in the previous lesson - would definitely hold you back. The things we learn in previous lessons aren't at all meant to be left aside as we move forwards. Every lesson builds on what we learned in the previous one, and having a lesson marked as complete doesn't mean you don't have to worry about it anymore. Instead, it means that you show that you understand what you should be aiming for, so you should be able to practice and improve upon it on your own. That's why those exercises become part of our warmups - there's loads of additional mileage we need to cover to really get those skills down firmly.