It starts with simple colour theory and the colour wheel. (ie primary colours, secondary colours and tertiary colours)
When mixing paints irl you usually add the darker colour to the lighter colour (such as blue into yellow) and do it in teeny bits til the colour is perfect. Learning to mix traditionally can really help digitally.
Also studying colour schemes such as triads and cold colours, warm colours etc rather than just picking a red, pick a cold red or a warm red depending on your purposes.
Mostly though.. look at art you love from all genres and see how they do it. I remember being shocked to discovered that art I thought was in 'full colour' was actually only in shades of red and yellow or green and purple.
I didn't know you could mix colors that way for some reason. I originally thought the only way to get different colors was adding more or less water to the brush (my paints are watercolor), and even after that, I'd only heard of mixing white and black into different colors, but never other colors. I seem to have a lot of misconceptions to deal with... Thank you for your advice!
Much as I love digital art, it has a lot to answer for with the fact you can just point and voila colour.
If anything you should never mix in white or black to get a lighter or darker colour unless utterly necessary.
Blue and Yellow mix to Green Yellow and Red mix to Orange Blue and Red mix to Purple And if you mix Red to Green you get a deep grey colour, so if you want to darken off a red you can actually add a green to dull it down. Same with Blue and Orange or Yellow and Purple...
I would totally recommend learning some colour theory and colour mixing no matter what kind of art you do...
A good way to learn colour theory is get real life paints. Like get what the store owner will tell you is a good starter kit, it will probably be a tube of only 5-8 colours. Mixing colours is really hard, but colour is something you learn easier in real life.
I have some real life paints that I've used before but I really don't know how to use them. I can't figure out how to get the colors I want without either wasting a lot of paint or using so little pigment that the image comes out too light. But the few times I did use real life paints I learned a little. Do they have tutorials for learning how to paint in general?
When working on portrait it would probably be beneficial to emphasize the colors of the eyes. After all...they are the windows to the soul I think a lot of it depends on how vivid you want the eyes to come off. I know that sometimes my pictures, or at least the way I imagine them in my head,are based off of the hair and the eyes. The clothing and backgrounds only exist to compliment them. But there are tons of ways to do it and It's all about what works for you
Thank you very much for your suggestion. I've never seen this artist before, but I see what you mean and agree with you totally. I'll go through her gallery and see what I can learn. Thank you for your help!