When I watched that video, it was a moment of understanding for me. I like how the guy dumbed things down for me, and emphasized over and over how anyone can do it. I'll add a couple things to what he teaches about juicing:
1. Make sure you take enough of the paint of of your brush when you are juicing. You'll see him use a paper towel to wipe it clean, and he shows you what it should look like when wiping it on the towel. That's fine, wipe it off this way, but test it on your skin. Draw a line when you think it's ready on the back if your hand somewhere. It shouldn't be watery, but it shouldn't be like dry brushing either.
2. Be patient. Juicing requires that you put down enough layers. The first few layers go down kind of rough. It won't look good until the pigment gets built up. This is where brush control comes in. When highlighting brush towards the lightest areas. When shading brush toward the darkest areas. Try not to lift up the brush in an area where it'll pool right in the middle. This means that for the most part you are sliding the brush off of the surface of the mini-avoiding as much as possible the lifting of your brush stroke in the middle of a surface.
3. I'll say again to make sure you apply enough layers, but this is even more
important with highlights and shading. When you do these two things, you are painting over another layer already. Because of this, you may think you've applied enough layers because you can see the layer beneath. This is a good thing, but as you move towards a brighter highlight it should be more opaque. A sign of a painter that had failed to put enough layers on his highlight can be chalkiness
4. Did I say make sure you apply enough layers? Well, now I am saying don't apply too many layers. When you do this it changed the properties of the paint and it turns glossy. I read this somewhere once and it changed my results quite a bit. No when to stop applying the layers. #1 it keeps you smooth and you won't obscure details of the sculpt. #2 it keeps the layer matte. This is graduate level stuff but that doesn't preclude you from striving for it.
4. Chalkiness can also be caused by other factors. Light colors, like white or skin, need not be diluted so much. Or do itself a favor and purchase VMC Ivory for all of your highlighting. Remember how Skel said different colors require different dilutions? This is true. Age of paint will change ur ratio too.
5. Did I say be patient? You will catch itself not diluting enough just to get the damn thing done. This will only downgrade your quality.
Thats it! Once you master dilution and brush control, the next step is understanding light theory. Always plan out how the light will play across the surface of whatever you're painting-metal, cloth, skin, etc. We can start a class on this next if you want
Really I hope this is more than just non-sensical rubbish to you. This is very meaningful to me because I believe everyone can paint, it's just their ability to learn it. It's just about when we have our moment of clarity.