How to shape faces with two speedlights for headshots and env portraits?

[Kyle.L]

I'm a hobbyist photographer trying to improve my indoor portrait work, and I'm feeling stuck with my basic two-light setup. I want to learn more advanced portrait lighting techniques to create more dramatic and professional-looking images, specifically for headshots and environmental portraits. For experienced portrait photographers, what are the most impactful modifiers or lighting patterns I should practice next, like Rembrandt or butterfly lighting? I'm working with a couple of speedlights and softboxes, and I'm curious about how you control shadows and highlights to shape the face, and what your go-to setup is for a simple yet versatile studio look. How do you adapt your lighting for different face shapes and skin tones?