If you want, absolutely.

I taught myself design & web development at the same time - way back when it all started, in the late 1990s. Those skills combined allowed my career to follow the trajectory it did, but more importantly, as a designer, it helped me be a better designer.

Knowing the limitations and the abilities of the platform you're deploying on means designing closer to what you'll actually see on the page.

So go for it!

Great idea to source colors from life, and have those go into a smartphone or computer for later use. The direct 'digital draw with that color pen' stuff, however, seems a little less useful.

You're not getting much love here, but honestly, we are presently in the midst of choosing between Marvel & Invision, and Marvel is winning in our PROs & CONS.

Keep up the good work!