dont worry about your foundation matching perfectly (it looks really nice right now) having a different color to your neck is normal AND ON TOP of that if you go under the sun and get tanned its even more normal (i personaly just avoid the sun and that makes it easier haha). anyways youre super cute and funny so i wish you success and TRUST ME it looks GOOD already! (btw omg this is so random but we have the same mole haha)