Hmmm none of them have very good toplines. Lumpy, bumpy, humpy toplines are what I see. You will need to cross them to females with very very good toplines, if these are all siblings the wonky toplines are probably genetic and may still end up in the offspring regardless of how nice the female is.
The last male has a nice dorsal, the others have their dorsals set pretty far back. The last male also has the best caudal as well. They all have pretty decent anal fins, not too long and pointed. If these were my fish, the last one is the only one I would consider breeding. You're going to have to be careful picking a female, she's going to have a lot of work to do counteracting the flaws in these boys.
ETA: Just a couple examples of girls
This girl has a slight spoon head, she wouldn't be a good choice for you
This girl isn't too bad, not a fabulous topline but decent
This girl has a really nice topline, smooth from nose to dorsal, this is what you want to look for