Hello, and forgive me for my poor English.

I really like your theme, but I found some small problems that bothered me.

In other themes, the org-mode and markdown levels are easy to distinguish. But in your theme, there seems to be no way to distinguish anything other than color. This is very difficult for me with color blindness.

I hope to improve, such as the difference in font size.
But I am an elisp rookie, so I can't provide PR for this, sorry.

Thank you.

Some screenshots:

Leuven Theme: