Well......interestingly enough, these snakes seem to actually come out with either 2 or 4 pre frontals. The sub adult male has 4, while the 03 female, which looks to be the same age as yours, has 2. It's been thought that the intergradation may have something to do with this trait, but neither sub specie is known for displaying only 2 pre fronts, so it's just a theory. Although, we have seen a few normals from the area that have shown only 2. It's kind of strange, but the 2/4 rule does not seem to be absolute in this regard. I'm planning to note this in observations for following finds in the area.

sub adult male

03 female
Eimon