if you buy dark couch with dark red wall it wil seem pretty dark overall....... so with the red walls and the creamy ent. center I would go for a creamy couch or maybe not so creamy but still light enough to stand out from the dark red.......

you can get the couch in any color of the flowers of the painting as long as it´s not dark and you can accent it with dark cushions or a throw.....in the color of the walls or similar shades......

the painting would lok good if you can take the frame off or if you paint it with other lighter shade........

JMO