This is the kind of combo of panels and roman shades that I like. You don't need to use the exact same fabric, but you could. Co-ordinating is also nice.
http://static1.squarespace.com/stati...ormat=original
If you want faux wood blinds, that could also look nice. I prefer white...but do you prefer wood toned?
I like your colour palette. A simple rule is to have 60-30-10 when it comes to colour. Sixty percent of the main colour, 30% of another colour, and 10% of the last.
When hanging artwork think 75-80% of the space. When hanging a picture or grouping over the sofa, it should take up 75-80% of the space, following the rule of the grouping shape matching the shape of the space.