Everything you do is a learning opportunity.
In late 2015, I was hired to animate a radioplay adaptation of the Legend of Sleepy Hollow. I took the opportunity to challenge myself by painting each background in a style I had little experience with. Here’s a comparison of two similar shots, the first from the beginning of the project and the second from the end of the project.
I like to think that I improved a bit!
If you asked me what is the greatest piece of advice I had to give to any aspiring artist — besides “draw every day” — I’d say this: treat everything you do as an opportunity to get better at what you do, whether it’s paid work or just for fun. Challenge yourself. Try new things. Learn on the job.