Blending is a general term that refers to making a transition or gradation between two or more different colors to create the illusion of depth. There are several ways to achieve this, including (but not limited to) layering, feathering, wet blending and glazing.

Smooth is a term used to describe a visually seamless transition between colors. Sometimes in the blending process you can see an abrupt line where you stopped using your first color and started using the second. If the transition is gradual and you can't tell where one color ends and the next one begins, that's "smooth".

Layering is the process of applying increasingly smaller and smaller areas of paint to the surface of a mini, Each time you change colors, the area of coverage shrinks, thus leaving behind a smidgen of the underlying color visible around the edges.

Feathering is a form of layering. It involves cross hatching paintbrush strokes to create a "net" of one color over another in the transition area.

Wet Blending is when you apply two colors right next to each other and while they are still wet you quickly smudge the line between them to blur the transition.

Dry Brushing is the process of removing almost all the paint from your brush onto a paper towel and then lightly dusting the raised edges on a highly textured surface of a mini with a lighter color to bring out the details.

Washing is the process of using extremely thinned paint to create shadows and depth across large surfaces on a mini, such as a cloak.

Glazing is similar to washing in that you use very thin paint, but it is much more controlled and generally used on small areas to help smooth out transitions in color.

Dark Lining, sometimes referred to as Black Lining, is when you try to make very, very thin dark lines where two different sculpted objects touch each other on the mini, like where the edge of the cloak meets the side of the pants, or where the belt touches the shirt.