How to deal with rejection at work?

I'm 18+ and have my own business

So I'm an artist and I work with a range of clients. Recently, I completed two art pieces for two different clients...I've made sure to follow their requests to the best of my ability.

As an artist it took a lot of time, research and a lot of energy mentally to complete these artworks. However they both didn't like the work and they refused to pay me the full amount.

Even when I made changes to the work, they still didn't like it. I charge them a really really low price at the end.

I feel rejected and I feel like I've failed as an artist - I went to uni to study art, did art&design for GCSES/ done a BTEC in a&d too

I am really passionate in what I do, I've always been creative and I worked really hard in my career.

I did my best to focus on my clients needs, done the work to a really high standard.

How can I deal with rejection if this happens to me again?