Some Head Breakdown Variants

Hey, so this is a weird question, but I just drew an asian lady for the first time and realized it was harder for me. Made me wonder if I its a problem because most of the people I see day to day are your run of the mill nodic-ish caucasians. First of all, have you found it easier to draw from your own ethnic group, or is it all the same to you. Second, is there a particular facial framework you use for various ethnicities?