I have a neat large picture of a red flower backround is off white

https://www.pinterest.com/search/pins/?rs=ac&len=2&q=bedroom%20color%20schemes&eq=bedroom%20color&etslf=12013&term_meta[]=bedroom%7Cautocomplete%7Cundefined&term_meta[]=color%7Cautocomplete%7Cundefined&term_meta[]=schemes%7Cautocomplete%7Cundefined

You could use the same color as the background . . . an off white, satin, or cream. Or use the color of the flower but in the lightest shade possible, which would be a very faint pink. Either choice would really make the flower in the painting pop! Then, for instance, you could use a cream colored bedspread with accent pillows the same shade as your flower.

What color is your frame? If your frame is black you might try a darker grey for more contrast. Have you considered a red wall?

Perhaps an off white in the same family as the background, but not necessarily the same color.

Ok a did my homework without a photo😊 I would paint just the wall behind the bed in red and I found a few comforter sets from kohls and if you have a credit card they are having that 30% sale going on and I have the code if you need it. Here are a few photos below and you can check them out on line. I choose red and beige to keep with the other wall color and that picture that sounds stunning and this will tie it altogether

Pale aqua looks good with red, great with the white background

Pale Green

I would go with a white. Look at the palette I am including.

Are you using a third accent color in the room that you can pull from to at least paint an accent wall? Or, have you considered using shiplap for an accent wall?

play off the colors in the picture. I would probably use a toned down flower color at least on one wall. How fun if you could do a wood accent wall as well