Isometric perspective is a bit of a misnomer, since it isn't really “perspective” at all. In isometric perspective, none of the lines recede to a vanishing point, and the eye level is fixed. However, it's a quick and easy way to create a believable scene.

A scene composed in isometric perspective doesn't recede into space.

In isometric perspective all of the lines that would usually recede are simply parallel to one another. Lines that would recede to a left-hand vanishing point are parallel — as are the ones that would normally recede to the right. Vertical lines remain vertical.

Of course, the drawback to drawing in this way is that all of your scenes will tend to look static. The reader's viewpoint will never change. Each scene will look like the one before it — resulting in predictable, boring storytelling.