Re: Is this tile layout the most efficient?
Tryin to save cuts is a waste of time, especially in a room that small. If you want your pattern to be on the diagonal, shift everything over so your first tile starts in the center of your doorway. If not, you will end up with an eyesore on your hands.
You also need to measure the length of the room to determine the size of the first tile, so you do not have less than half a tile at the end of the room (See Reelescapes photo for reference).
No offense, but if you were to set the tiles the way you show them, it would scream DIY job.