Mercy is an original character of mine, she's a feral siren (a siren native to the human world, not a "Dazzlings" siren).  Full drawing link is below!

Full drawing: https://www.deviantart.com/wubcakeva/art/Mercy-Show-Style-792361755
Check out my DeviantART if you're curious about my OCs!

FAQ:

What program are you using? O:
Paint Tool SAI 2.

Tablet?
Wacom Intuos Creative.

How long did this take you?
Honestly, I don't really know xD

I wanna give you a tip!
You can do so here: https://paypal.me/wubcake

But how do you make it look like an EQG vector?
Its in the lineart! Basically when I do the lineart I max out the lineart so there's no minimum size. All the edges are rounded, then I go over and sharpen them by erasing! ^^