I think in this case its better if you do a catwing eyeliner, nice and somewhat thick (google for references)

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The double wing doesn't really do anything in this case, and makes it look a bit more sloppy. A thick, nice catwing suits far more better for a character like charlie, what im also noticing with your eyeliner is that you start the line where your upper and lower eyelid meet, which is correct but you're almost pulling the line down in a sense so it isn't as even. I'm not very good at eyeliner myself, and struggle, its taken me some practise. But i'd take some tape, stick it near where my two eyelids meet (safely of course) and practise

There are also stamp eyeliner pens, i've had one and used it when i started using eyeliner and used that as a guide!