the head of the pastel lesser has more blushing going on than a lesser. but I had lesser hatchlings with very good blushing on their heads too. one thing that helps is the stripe on the side of the head that goes threw the eyes. on lesser pastels, this stripe tends to be jagged looking where you can see points in certain areas. where the stripe on lessers seems to be a lot smoother. here's 2 pics check out the stripe on these to see if you see what I'm talking about.
if you didn't have a pastel lesser to compare the lesser to, you might think there's blushing in the lessers head. I had lessers with more blushing than this one which makes it even harder. but the stripe helps a lot. see the points in the pastel lessers head stripe?, I usually look at the ones by the nose. for those who don't know the pastel lesser is the first one. hope this helps. don