Since it appears to be an attic room, I'd probably not add curtains -- just leave the blinds. If I added any fabric window treatment, it would probably be a swag valance that would cover the window frame and the top of the blinds but not the window itself.

You could swap the miniblinds for plantation shutters that would enable you to close off the bottom half of the window but leave the upper half open for light or close both upper and lower as needed.

http://kimbolte.com/cost-of-plantation-shutters/plantation-shutters-cost-of-per-window-how-much-do-piqed-for-designs-with-remodel-15/