How would you accessorise this dress to jazz it up a bit

[sweetheart]

this is the cobalt blue colour

The colour of the dress is really vibrant and lovely. It just feels a bit "safe" with the blue belt. What else would it look good with?

would a very thin leopard print belt and a pair of leopard heels be too much?

That'd be lovey, fab in fact. Or leopard belt and red heels.