Red, Red and a bit more Red

I struggle a bit with colour schemes unless I give myself a definite palette before I start.  This last week I've been trying to concentrate on one colour, with a plan to go through all the rainbow hues.  I've just done red and, whilst, I have at least been adding to my sketch book each day, I'm not going to carry on with this single colour, it's too limiting and I ended up cheating and adding green towards the end anyway.