Today saw it all change. Sharon's muted colours suggestion helped. I had already used the palish green for the outer areas of background but then added to the pulled satin area. I feel that this has done what I wanted. I am grateful to everyone for their helpful suggestions. The support in this class is great.
I may add a couple more red lines but I think I will wait and see how the whole thing develops first.
Now I need to work out how to do the butterfly. It is to sit in the top left hand corner. I envisage it as fairly delicate. Perhaps the wildlife of Brisbane area book can help.