I love little close-ups like this in photographs, so I thought I'd try painting one. The reference came from a hike in the Wallawas (in Eastern Oregon). You'd think I would have just popped into my backyard. : ) But no, I like to do things the hard way.
I also have a fabulous tip for you! Sigrid Junold Käppeler sent it to me after struggling with painting an ellipse. In order to see where her mistake was, she painted concentric circles on a piece of glass/plexi and held it up (tilted) in front of her painting. It sounds confusing, but a picture's worth a thousand words. -->
You could also try holding a glass cup up in front of your ellipse. Also, my husband pointed out that you probably need to close one eye when looking at it. Happy painting!