Leah, I love your work and do see growth. I recently picked up an old painting that I painted about 12 years ago. OMG, was it bad! I could not even believe that I tried to sell it!!!! That was when I first started selling work. Since then, I am in galleries almost weekly soaking up the beauty and skill put into the work of fellow artists. I think that it indeed encourages you and you glean a bit here and there from studying others work.
Also, if you are devoting more time to painting than before, practice improves your work better than anything else. At least that is what I have found for myself.