I was looking through the 7th edition codex...
and I saw things like this:
and I thought, "That's amazing!"
Started painting a few Eldar Guardians... and I was trying to go for something like "armor on the guardian one color, cloth stuff underneath another color"
and I ended up not knowing how to find either on the model! The guardian model "cloth" faded into armor pads that didn't provide a good surface for the army.
So now I'm thinking like this. I'll use white and blue as my colors, blue as the primary color and white as the secondary color, good for things like helmets.
I'll prime the model white, then paint over most of it in blue, leaving the gun and the helmet white.
Then I'll wash the whole thing with a dark ink wash.
Then repaint the surfaces of things the color I want - very similar to the tutorial Cavalier
My short summary: I tried to paint Guardians the same way I would paint Tau or Space Marines, kind of "paint by number," and it totally didn't work, so I'm learning from the resources here, and it's still hard but I'm learning and adapting.
It seems impossible though to get the ultra detailed paint schemes that I liked from the codex.