Hard Foam....
Looks like the surface of the hard foam used in creating the head is too shiny or slick (for whatever reason). It's been my experience in painting hard foam that paint won't stick unless the surface is roughed up a bit or something like rubbing alcohol is used to clean the surface if it's been handled (oils from your fingers/hand). If you choose to rough it up, use an emory board to do it lightly (you're not trying to make the head smaller).
You might try dipping the head in a primer before painting it. Not sure what type paint you're using but a good model aircraft dope/paint such as Aeroglass or a vinyl lure paint will hold. Caution, vinyl lure paint stinks for along time after painting. If I use that stuff I usually leave the bug on a drying rack for a month.
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