I've never felt comfortable with my technical skills. I envied those book cover artists I grew up admiring. Landscapes, urbanscapes, ruralscapes, I wanted to draw them but think I lacked skill.
I've since used Inktober to do my own Vintage and Art Deco pieces. Studying the whimsical, fluffy, and effervescent backgrounds and settings in illustrated children's books all the way to the highly technical and detailed in many Japanese manga. I bumped up my Watercolor skills last Inktober and this year, I needed interiors and backgrounds.
I also drew most of my scifi characters from memory. I did five backgrounds - 3 dorm room interiors, and two urbanscape. If I can consistently draw several longstanding characters from memory. If I can do better backgrounds, I could greatly expand and make myself more commercially viable.
Increase the odds of more illustrations published or showcased. With a new medium such as designer markers, it seems I can do just that. And if I use graph-- dot grid journal paper, I feel more comfortable doing buildings and structures. I can do a blend of technical with fine art since I favor impressionistic paintings over photo/hyperrealism.