Toffle: great photo.
I too, play with Dollar Store lenses.
I have several mounted in plastic barrels with aperture stop slots similar to this one.
I found that I really like the image projected by a simple meniscus more to my liking for portraiture.
Some have confused this simple meniscus as a "Petzval" lens.
Not even close...
Petzvals are complex lenses which have evolved over the years, as this website illustrates:
What's fun about this project is that I'm able to merge photography with my ability to run a lathe and create fun things, such as an easy-to-use camera worthy lens with unique imaging character.
It's a never-ending voyage of discovery...