Thanks. It is really going to depend on the Curry's policy. Their policy states: If for whatever reason you change your mind and would like to return your order after delivery, we’re happy to refund or exchange your purchase as long as it’s unopened and in its original packaging.
Clearly you have opened it here so that can not apply. The next thing is if its defective:
We will offer either a repair, exchange or refund if the fault occurs within 30 days of purchase (or delivery or installation)
However the difficulty here is you are just not happy with the picture, it is not as if the goods are faulty.
So are you entitled to a refund or exchange to another, strictly the answer is no because it is not defective.
However the store manager may be sympathetic and exchange it for you.
I am sorry if this is not necessarily the answer you want and certainly not the one I want to give you, but I have a duty to be honest.
Can I clarify anything for you about this today please?