If finding a donor that looks like you is important to you then I think you should keep looking. My donor kinda resembles me. She has the same eye and skin color and body type. We have the same heritage and blood type. I like what she wrote and she has a healthy family medical history. Those things were all important to me. I put a hold on her, thought about her over a day or two and then placed our deposit. Then I was absolutely convinced she was the right one even though she had a previous failed fresh and frozen cycle.
My baby has the same coloring as my DH, DD and me. I don't think you will care once your baby is here. But since you have the choice now you should pick who you are comfortable with. The donor you are thinking about sounds like a good choice for you though. Can you put a hold on her and think about her for a few days?