What are the main colors in the color wheel

After selecting all bones, which command resets the bones to their default poses? alt + r shift + d alt + p u

What does it mean to have a bias (for example your bias of bts)?

To create an illustration of perspective, this artist did all of the following except 1) show clear orthogonal lines 2) have an implied vanishing point 3) distort proportion to keep the background and foreground the same size 4) include value changes between the foreground and background i was thinking maybe 1