What I’m seeing from your comments @NeroCorvo is that you are best suited for Illustration, now, at this very moment. With those skills, you should be able to get a quick portfolio together and begin contacting newspapers, city magazines, and ad agencies, book publishers, PR firms… and of course Biomedical Facilities… (everything medical is BIG BIG Business right now and projected to be so for the next two decades)... I make a killing just doing portraits for doctors, surgeons, dentists, scientists… and they always need web sites and print collateral to promote their services and research.
You can do this right now, and learn design theory as you proceed. But I’m telling you, running a project is nothing to take lightly. It’s not easy managing a team of creatives and having your head on the chopping block for billing, client babysitting, and creative direction. That’s an earned skill, and not one that everybody wants or needs to pursue.
I ran an agency with 13 employees and took care of everything from sales to accounting in house. It took me so far away from my photography that I closed the doors a few years ago. I’m much much happier just doing what I love (photography), and leaving the business stuff to others. If you’re an Illustrator, then be an Illustrator. Your services are needed. You’ll just have to network a bit to get into the groove.
How hard would it be to convert your fine art illustration into commercial illustration?
I just did a copy job for an art gallery who was promoting the work of a recently deceased commercial illustrator as fine artwork for a gallery showing. The lines between commercial and fine art illustration are often very thin. Good Luck!