I do the same thing. I learn from what people point out. Maybe it all didn't stay in my head, but lots of it did, and what didn't will pop up in another picture, be pointed out again, and sooner or later, the idea will be implanted. I think the easiest for me to retain are very simple, direct things like when I made the gleam in Starman's eye too big. I didn't do that again. That was straightforward and easy to fix, and it was easy to remember not to let it happen again.
Speaking of planting a seed....I've talked to Rave about how you guys get emotionally involved in your artwork and get great satisfaction from it and I don't. I feel good when they turn out but I don't get that sense of satisfaction or fulfillment. We both came to the same conclusion almost simultaneously. My drawings aren't my work. I didn't create them, I copied somebody else's work. So until I can draw from my own ideas I'll have to settle for just feeling good, which is just fine for now.