>>38476035If this is your work, then the shape of the lineart is already really close to the actual official artwork. You can look online for how to replicate the official pokemon style P easy - especially if you wanna replicate the watercolor style.
Pic related is something I managed to do just by looking online and downloading a Paint Tool Sai brush, its hard to replicate if you're trying to do it on your own but once you get the right brush settings its a piece of piss.