So let's say I have a client that's gonna buy a website, we have discussed how its gonna look, and any extra pics, banners, whatever during the process will be for a fee.

And the client pays me 50% of the total amount, in the beginning.. I start designing the website and at the end when it's finnished (It looks like what we've discussed in the beginning) he dosent like it. He totally wanna change the whole layout.

How should I act?