The window dressing often makes all the difference in the world to a space. I find that having useful things also be decorative instead of just having decorations really helps a lot - for the plants, it might be worth it to get an aloe plant, for instance, which is very useful and pretty. Sometimes it's good to get nicer pots and pans that you can hang as part of the kitchen decoration (not necessarily in a caravan!) rather than put up pictures. And so on.

Have fun with Carla!