The view is partially blocked, but light can still enter the room. Make simple shelves by placing brackets along the window edges and attaching supports and shelves. Use inexpensive fabrics for window coverings. Gingham and other dressmaker fabrics work well. Try using unbleached muslin or burlap for a country look.
Sheets provide a lot of fabric at a reasonable cost.
Paint that old venetian blind a bright, cheery color. You'll be amazed at the results. To add an extra touch, paint a design on the blind so when it closes the design takes shape. Make windows appear larger by extending the window treatment beyond the window area. Stencil on a design or cover them with fabric.