Beautiful image. As it's so large, I'd place a timber hall stand underneath it, and lean it against the wall rather than hang it, then I'd place a collection of relevant objects on the table. 1. A lamp, perhaps a ceramic base with native American colour and shape, or simple pottery base. With a simple calico shade. A pottery or timber low tray with some tactile collectibles, like some river pebbles, different rock, a piece of and old timber branch, thats been smooth by touch, or timber carved balls. ( I know you're probably thinking what?) And lastly, I'd hang it above the picture, or rest on a table a feather headpiece. You can get these online, even I've seen them around Melbourne in odds and ends stores. Maybe if it's on your table, a timber head that milliners use for a display. You could continue this look with an Aztec looking rug or cushions to break up your leather couch. Mohair throw might look good too.

As I said before keeping clutter under control is the key, get lots of storage ,you said cost is I s an issue. Look at IKEA they have solutions for wall units that you can get in different colours and that in itself will brighten the place. You would benefit from a buffet next to the kitchen /dining area or a large wall unit with lots of shelfs and drawers, coffee table with storage drawers , storage unit with baskets for kids toys and school stuff, once you have this under control start adding rugs if think you still need it. By the look of it you have small kids get them to put things in appropriate place and get some funky coat hangers in the entrance so they can hang hats and bags etc.

Before replacing your curtains as this can be quite expensive for such a large window, if they are in good condition, add a band of extra fabric to the bottom in what ever suits you, your existing curtain track can then be moved up to the ceiling for good looking full length curtains without the large round eyelets, could save you a lot of money, I would look at replacing/removing the sheers cheers

you could look at staining this one>? Bamboo Woven Ply - Bamboo Australia | Sunshine Coast or may I suggest a good detail joiner could make it to your custom panel sizing and finish it suitably for the kitchen splashbacks (if that is what it is for>?) I can suggest someone who would be able to custom make this if you wish.