I tried and cannot find info on the source of this comic. Reverse image search turns up nothing, and I didn’t have any luck with the exact text at the bottom either.
If I’m reading the signature right, it looks like the cartoonist is G.B. Inwood. It’s likely early 1900s based on the style.
Honestly, you have to go into it with the goal of making bad paintings. Just tell yourself, today I’m going to make a truly awful painting. If I’m ever going to learn to do this, I will have to waste paint and canvas. I have good paintings in me, but they are hiding behind a number of terrible paintings.
I will never know that number until I’ve painted them.