Photoshop a bedroom to spruce up the surroundings

We have a photo taken by a customer in which our product looks great but the bedroom isn't yet finished - ideally, we would like someone to photoshop the surroundings to look a little more 'finished' and plush. Both a bed and the surrounding walls are what would need to be altered.
We will supply good quality photos and instructions as to what needs to be left. The photoshop needs to look relatively convincing so as not to detract from the product.