Lunar eclipse above the atmosphere
It wouldn't look much different. The atmosphere absorbs some light and "seeing" reduces the effective resolution, but these have little effect on the visual impact of a lunar eclipse.

From a sufficiently high orbit, you might be able to see the terminator between the partially lit "red" side of the moon and the (nearly) completely dark side on the far side from the Earth (and the sun).

A lunar eclipse looks pretty cool from the Earth, and it would look equally cool from space.