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.
Do it. Worst that can happen? You fuck it up and paint over it (or get a new canvas). I’ve spent so many years not doing art for fear of the same thing, and I’m only getting older. You have the desire … start with a splot of any colour on the canvas and go from there.