Not So Much Math-Art As Art Where Some of The Markings Look Like Math

So here are two more I'm working on. Of course the background of previous drawings is shown below this post, so it's chronologicly kind of backwrd to start from the top and scroll down.

Are these done or in progress? I'm learning that density of marking has some to do with this. Time extent of non-marking and confidence of intention are important also. Plus, of course, having a good subject number helps