Is there a general rule to put outline/contour in isometric pixel art and what color should be used?
I know the inside can be outlined not by black but by the color used, but what about the outer part (the edge?), should it be black always or colored, and if colored, in what shade?
What is the general concesous?
Example shows edge of different colors used in edge, should it be always black, should it be same color of the part near the edge, should it be darker shade of the color near the edge?