Right now it simply grabs the most recently posted photo (of yours) and uses that. In the (hopefully near) future I'll have it so you can tell it which of your photos you want used as the thumbnail in your list.
Name: Suzanne/Sue Sebastopol, CA (Zone 9a) Sunset Zone 15
It should show a bloom now, I gave a thumbs-up to one and it bumped it to the #1 position. If someone else goes into the entry and gives thumbs-up to another image, that #1 spot image could change. I agree, a bloom is better than a seed pod!
I am a strong believer in the simple fact is that what matters in this life is how we treat others. I think that's what living is all about. Not what I've done in my life but how I've treated others. ~~ Sharon Brown