All looks great. I agree, interesting flame pattern.
As to that thin leather, I have found it to be the most forgiving medium so far.
Plastic slags when too thin and wood wants to crumble and turn to ash when made ultra slim.
Leather just takes it in stride, even the 4 oz 0.080 stuff I use a lot.
Thank you for the tip, I have to try leather so far only did plywood and some paper tests. Oh, I have to do something on cardstock this weekend too. Looking forward to it