My project in Creation of an Original Logo from Scratch course

Hello! This is my finish version of the progect Spaceman. I tried to add some texture (dots) as you reccomend and it looks cute! I changed colors of brend and prepared the progect for Behance.
I have a little problem with dots, when I save this progect as pdf or jpeg for some reason pots looks like broken, I don't know why it's happening, if you know why, could you please help me :) maybe it because they are too small