Hi! It's a great space and has so much potential! I'd bring in some color. Maybe try a painting on the wall to the left of the brick (remove plate and candles). Then I would put a floral arrangement (not too many flowers) that is tall with branches or grass and brings in a little color to sit in front of the mirror.

Hi! Looks like you have a lot of room to work with! I think that I would consider hanging a large tapestry. Here are a few options:

http://deciture.com/shop/decor/7/acanthus-vine-tapestry/

http://deciture.com/shop/decor/7/florette-tapestry/