Hi and welcome! Before getting Bella, I had seriously considered getting a Morkie/Yorktese. I thought they were oh-so-cute! Then, a friend of mine asked what they looked like when they got older, and I really didn't know so I looked them up. Every picture I saw of them was pretty scary and to me they just didn't look "right". I'm not trying to be mean, or discourage you... I just hope you've seen the adult Morkies/Yorktese's as well...
I know you asked about the coloring, and I don't really know about that. Sry.
Good luck w/whatever you decide!!!