Water colours

So I don't know if anyone has noticed, but I recently in the last month got into water colour. My friend slugette recommended a paper that doesn't fight me when I use it and suddenly, water colour art has become fun, and enjoyable I honestly thoguth till now that I was just rubbish at the medium and there wasn't any hope for me

So, right now I have 3 successful pictures to my name
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I'm treating the water colour a bit like copics for now till I get use to using them, but I'm super proud of myself for how these are turning out TuT

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In saying this, I need to do some studies on skin colour cause MAN, that is kicking my ass big time My pale skin tones are fine, but the Rainbow haired guy (Silvyr) is meant to have olive skin, like this:- 

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and Nakota (long haired guy) is meant to be Shoanti, which is Pathfinder's "American Indian" race. So... he'll have brown skin, but I don't think I'm shading it right  

So, I'm going to do some studies of skin tones. I don't know how I'm going to do it, but it's really highlighted the problem when I don't have swatches to work from like I do in digital art I need to be able to see the colours, and how to mix it. I may need to buy a few colours for my water colour set to do it too cause my blues are pretty powerful. 

If people have recommendations for how to do this, I'd love to hear it