Blending
This is the hardest basic technique. The key of blending is to... well, blend 2 colours together for a maximum smooth effect. The colours just flow into eachother.

This is not simply splashing 2 colours on the miniature and brush them together. You still have to mind highlights. The lighter colour comes high on top, the darker colour goes in the deeper parts.

For ease and to begin with I’ll start with a flat surface. A key object is when you paint with colours that don’t cover very well in the first layer, is to get a solid basecoat of the lightest colour first. Or in other words, the colour that covers the best should be your basecoat. For example: Yellow. Over a black surface, you’ll need 3 or 4 layers of yellow to get a solid basecoat. Same is when you are going to blend. You will see the black right through the yellow if you don’t basecoat it first.

As another example, I paint a Scorched Brown surface on a miniature to Red Gore. Red Gore covers pretty good so I’ll leave the basecoat Scorched Brown.

Wait for the basecoat to completely dry and in the meantime you ready your paints.

(note: painting with a lamp who gives a lot of warmth on is a negative thing at this stage. Because of the warmth the lamp gives the paint will dry up faster. You can add a little water to the paints to keep them a little longer wet but don’t water them down to much since they still need to cover the surface).

Paint a blob of Red Gore at one side and clean your brush. Next, paint a blob of Scorched Brown on the other side. Changing the amount of paint will result in a lighter blend or a darker blend. But I’ll stay with the 50-50 mix. Clean your brush again and carefully brush one colour towards the other, in my case, Red Gore.
Clean your brush if your blend isnt good enough and carefully paint the Scorched Brown towards the Red Gore again to get a nice smooth effect.

Coninue doing this until you have a perfect blend and there you have it! A nice perfect blend on a miniature. You can add some touch-ups later when the layer before dried up.

Do not try to touch it up when the paint is still wet. It will cause the paint to chip off because its in the stage of drying. Always wait until it has dried up and after that you can try it again or mix a colour to do some touch-ups.

HINT: I really recommend you to use some kind of diluter for the paints so they won’t dry up in less than a minute. I use retarder for this. This stuff is like varnish. It keeps the paints nice and wet but it dries up with a matte finish.
Once I used it on a paint on my mixing pallet and went to bed. Next day, roughly 12 hours later, the paint was still wet. It was in a bad condition but still use-able.

Conclusion
Good luck with blending, I hope this vid was useful to you. Comments, critism or anything else appreciated