Megan Weaver of 200Lemons has serious skill with watercolor. The quality of her washes to create all manner of creatures is enviable. I highly recommend her Instagram for more painting gems.
What color do you wish wasn't there?
If I am being completely honest and exposing my artistic secrets and quirks... When it comes to my palette, I am quite organized and need to have it clean and in order. The majority of the time I'm happy with each color that is there, but I don't like when I've left too much white on the palette. I only use it for final highlights and sometimes it can run into my other colors and make them cloudy and unusable.
What is your favorite brush?
The smaller the better. I tend to work pretty small and currently paint with a 000 Winsor & Newton Cotman Round brush.
What is your favorite paper/surface to paint on?
Arches Cold Press watercolor paper. I buy the large sheets and rip them down to smaller 4x6 -5x7 pieces with deckled edges.
What is your favorite color to work with?
Black and Indigo. They are two colors that can take an underpainting and really make it pop.