Well, I guess that not all Twilight ভ্যাম্পায়ার have to be pale from...well, what আপনি just said; Laurent is black. Perhaps whether a vampire becomes pale অথবা not depends on his/her ethnicity. If a vampire was Caucasian অথবা Asian, any ethnic background that allows them to have white skin, then maybe they are the ones who are shockingly pale. However, if a vampire was African-American অথবা Hispanic অথবা any other ethnicity that makes the person have a dark skin color, they keep the skin color they had when they were human. So maybe this explains why Laurent, unlike most vampires, is so dark skinned.
And don't worry, it doesn't sound racist at all! That's actually a pretty good প্রশ্ন to me :)