Trying something new

Trying something new, but of course i always have to use my go to face glue for that per base!

Does any one have any tips for people who have an un even cupids bow like mine?? its always looks wonky and it i try and over line one side with lip liner it looks weird.

When using lighter shades its not so bad but when using darker shade lipstick it's really obvious. I'll keep practicing but any advise would be great. xx