Not really a tutorial, but I don't know where else to put it. D: I made this mainly for my curiosity, but it might be helpful to others too.
(don't know how though...)
I use three brands of watercolors and they all color differently: Reeves is the inexpensive brand and it's good for transparent coloring and for the faded look. I like their brown and black paints. Sakura Koi is the brand I mainly use. The paints are kind of powdery. The washes are more translucent and good for flat coloring. It's also brighter too. Dr. Ph. Martin's Radiant Concentrated Water Colors are very bright, but they don't mix well so it forces me to buy a green and brown bottle when I would have normally mixed those colors myself. For me, they're a lot harder to control.
They also look different when they get scanned too. *I didn't edit the scan at all.
WOW, this is really weird, maybe Dr. Ph. Martin's react really strangely to light?... I don't know, it's really weird. The first two look the best, thought the softness of the first one would be great combined with the hues of the second one