Looks pretty good. Your strike angle is a little too oblique to knock the nodule in half but that's all I'd change. To knock off blades, you put the polyhedral core between your knees with a cloth or leather wrapped in a loop over your knees and under your feet. You tighten the loop by spreading your feet and this holds the core steady while you strike off the blade. I'd probably have to take a pic of the setup for you to understand my description better. I have a video of Archie Peter Ainsworth from N.Mex. doing it. Gary
These pictures give a better sense of the size.
Very small. Makes me really think about the purpose of those flakes of Jasper that are sharp, but seem too small to be useful. They must have had a purpose.
I kind of wonder if these small flakes could have been wedged into a crack of a stick and used like an exacto-knife-blade rather than held with the fingers? Otherwise they seem kind of small to hold?
I'm not sure if this piece matches your illustration it seems to have some similarities. I find Red Jasper flaked tools here Sf Bay Area but not points.