Thank you for the nice comment @arrozymangophoto :)
Yes, it is a very popular technique to mix watercolors and then go over with pencils to sharpen the details (if that is what you aim for).
I added the neon reflections on her in the end in Photoshop :P Because unfortunately i do not have gel pens or metallic/neon paints/ink to get that effect traditionally.
Glad that you like it :)