First let me say welcome to the site. Well that is the million dollar question. It is hard to pick at 8 weeks old as they will change so much as they grow. I have seen some look great at 8 weeks, and by the time they get 12 weeks the other one looks better. You will first look at how much bone they have, compared to the others. The length of their body, how tall they are compared to how long they are, how they stack, their chest, head, and how they walk. Usually the breeder will pick two or three that they may want to show and keep them until they get older then will pick the one they will keep. We had a little girl that just looked great when she was little and we just knew she would just knock everyone's socks off in the ring, but when she got older, she just stayed a little 42lb girl and stayed there. She's beautiful, but too small to show and breed so we had her spayed and found her a fur-ever home. I have two beautiful girls right now and the one at 8 weeks of age we thought would be great to show, but now they are 13 weeks old and her sister looks better and is a little stockier, and stacks nice, so we will see in a few months how they look. So to answer your question, it's hard to pick a show pup at 8 weeks of age. I don't know if I have ever seen a color chart anywhere. Only the description of the colors.