Ignorant of plant names, need help learning

I've been photographing flowers and other plants lately and using them to form digital art. However, I am quite ignorant of plants and would appreciate help identifying the ones I use. One mystery flower is attached.

Thanks,
David

 

This is a Dahlia hybrid. Not sure we can specify which one it is because there are hundreds if not thousands of them.

 

Thanks for the identification

Thanks. "Dahlia hybrid" is close enough, for my purposes. I'm very grateful for the quick response.

- David