i agree with some of the above - the charm is quite large - a smaller/simpler charm may work, or no charm at all even. Buy your azur speedy is gorgeous gorgeous gorgeous!!
To be honest,it's a little too much,it is very cute tho and you had a great idea putting it on,but hey....if you really like it,then there's your answer.
I like the charm, but I think you need to put it on a short and thinner chain. Cause I agree that the chain is alittle overwhelming. Other than that, the charm is really CUTE!!!