I really like this style, for the reversible feature, and all that stitching, and any of the colors would work, but I kinda like the coffee tone. Ecru/Khaki-- I think is about the color of your walls. Your curtains are basically a neutral also, so if you like them, I think they could work, and the blue one here is very pretty tooo...and the dark gray is very elegant looking...<https://www.birchlane.com/bed-bath/pdp/gayla-3-piece-reversible-coverlet-set-trnt1574.html?piid=21302302>; If you go with the gray, you might try to find some gray, ecru, yellow, toss pillows...Here are just a few that came up when I searched for that threesome...only Lord knows WHY links have to be 4 lines long......LOL........<https://www.hayneedle.com/product/yellowblossomdecorativepillowbybetterhomesandgardens.cfm?source=pla&kwid=IndoorPillowsandThrows%20newskus&tid=WALM328-1&adtype=pla&kw=&lsft=adtype:pla&gclid=Cj0KCQjwpvzZBRCbARIsACe8vyIzEg3D2nVf0b6EKQ1s5gZ1y-ckSLOOQEwoU2XEogHgv-Ap1M0gNqAaAuSHEALw_wcB>  or & <[https://www.houzz.com/products/ikat-argyle-birch-rectangular-throw-pillow-prvw-vr~37260070 [(https://www.houzz.com/products/ikat-argyle-birch-rectangular-throw-pillow-prvw-vr~37260070) AND this one!! on sale: <[https://www.houzz.com/products/gray-damask-pillows-cover-burnout-velvet-18x18-pillow-case-gray-silver-damask-prvw-vr~14607587      [(https://www.houzz.com/products/gray-damask-pillows-cover-burnout-velvet-18x18-pillow-case-gray-silver-damask-prvw-vr~14607587) See, now you HAVE to get the gray set? LOL....<[https://www.houzz.com/products/silver-art-silk-12x18-medallion-crystals-lumbar-pillow-cover-crystal-circles-prvw-vr~28268496[(https://www.houzz.com/products/silver-art-silk-12x18-medallion-crystals-lumbar-pillow-cover-crystal-circles-prvw-vr~28268496);

Curtain panel doesn't look like it'd be 'full' enough... for me, I like less morning sunlight! If you don't want thick darkening curtains, maybe blackout cellular, or roman shades.

You said olive - it doesn't hurt to think it those terms [what tone is there with the grey]. Yes purple but I'd go more deep lilac, or light eggplant: which is more like mushroom-y olive grey. Deep sunset peaches, salmons are great / are often displayed with lineny color... your paint is a question...

Are you keeping paint color [is it deep cream?]

https://www.groupon.com/deals/gg-4-piece-luxury-home-bamboo-blend-sheet-set-in-light-colors

This eggplant might seem somber, but not with a pillow, art.

Use fabric in photo for seat of chair / or as a throw?

https://www.groupon.com/deals/gs-reversible-all-seasons-comforter-size-full-queen