Nice looking ornate. My guess is it's a boy.

A fair number of monitors have blue in them, but usually those small variations in pattern or colour don't amount to much, especially in species with big distributions, so it's always best to look at more reliable features.

Lace monitors often have blue on the sides of the neck and on the lips:

Komodo dragons from Rinca and Flores also usually have blue on the lips and snout.