Color, color, color. It's all about the color to me. I look for a Lesser I feel is a good example of the morph. If possible I request to see pictures of the parents to get an idea if the color is genetic.
If the Lesser has the coloring I want I'll make sure he is a solid eater and healthy.
There is no guidline to what is a good colored Lesser though, it's more personal preference. Get a snake that you will be happy with.
This is the Lesser I ended up going with. I choose him for his pattern and yellow coloring:
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