The normal rotation is for the starboard (right-hand) propeller to turn clockwise and the port (left-hand) propeller to turn anti-clockwise when viewed from astern looking forward.

This means that at the top of the turning circle the blades are moving away from each other (outwards).

Some vessels will have them turning in the opposite direction which although can give better slow speed manoeuvering is less efficient.

On a model the direction of turn can be either way as it seems to work just as well, model propellers do not encounter the same problems with cavitation etc., as the full size versions.