This is a fanart for a video game called League of Legends. It's suppose to be a poster image of Light vs Dark. I'm heavily influenced by Amano Yoshitaka works.
Some of the colors seems faded out. But I'm not sure how to fill in those color without changing it into another drawing style other than watercolor.Feedbacks and guides are welcomed!
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I think you nailed down the "wash" aspect of the colours. I think you need to add stronger lighting and contrast, and make use of more texture and grit to really sell that it was painted with that traditional medium. You do this by using a set of brushes that works in your favour.
Check out the work of Yoji Shinkawa, maybe it'll give you some ideas: