Slingshot tan lines

Can you spot the tan lines caused by the slingshots. The bright yellow single string sling is slightly larger than this black teardrop.


Lines where the strings run up are starting to appear despite moving the strings whilst out in the sun.


A finally picture that shows the tan lines caused by the top of the teardrop. Also, a V shape appears to be running up from the top of the teardrop each side of my belly button.