Lowing 3_black cow, cattle, white face, small oil painting

"Lowing 3"___6 x 6 oil study on linen___$150
The cattle are still lowing...I have revisited the farm lately, via photos and a few small studies. Compare this "Low-er" with yesterday's. It appears that it is the same cow, and I think it is. Funny, as an artist paints, our eye records MANY things each time we look up. We take note of proportions, and negative space and lights and darks and all the art terms you can think of...These things stay in our memory bank, stored up to use later on another painting. While painting the "bangs" on this cow's forehead, I remembered painting similar shapes and textures in yesterday's work....same cow! To you art students: THIS IS WHY carrying a sketchbook is SO IMPORTANT. I worked from two different photos that I had taken, but did not remember or notice the similarity in the photos of the cows. Shooting pictures really does NOTHING to improve your art technique...but sketching does! Do you agree?