Exactly!
I never said pick the best looking animal regardless of Health.
Health and looks are both very important.
Also Ouroboros, I never said anything about a guarantee. The only guarantee in this life is we will all die.
The subtle differences that make one example of the morph in question better looking than another of the same morph do depend on genetics, not just the genetics for the morph itself but also the genetics of all the other subtle traits that make it a more attractive animal. So if you start with the best animals you can find you have a much better chance of producing animals of the same quality or better. Don't get me wrong you can still produce an ugly baby from pretty parents, but you are more likely to produce pretty babies from pretty parents than ugly parents.
That said, I will agree with one thing you hit on Ouroboros. Everyone has different tastes and what one person likes another person may not.
So find healthy animals that are the best example of what you like and selectively breed them to make better versions of what you like...
The Future is Quality Selective breeding, not pumping out as many of a morph as you can just because you can and flooding the market with ugly examples of the morph!: