I think it might be that your sofa's a little too complicated to translate into greyscale easily – it looks wonderful in colour, but with all the different shades of grey, it starts to get a bit busy, you know?

I'm thinking maybe try getting rid of the rug, moving down the sofa (possibly making the arms/seat cushions the same shade), and using a taller typeface? Maybe Oswald, a personal favourite of mine, or something blockier, like Franchise or Natasha?