Ask HN: Photo web gallery hidden costs

Hi,

I have a photographer friend and he recently asked me if I can implement a simple web photo gallery for him. Basically he wants to be able to upload his own photos under some permissive license and let other people use them for free.

The web dev part is not a problem. What concerns me are the hidden prices in this kind of application, like bandwidth cost etc ... He plans to start with 5000 high quality images and upload regularly other images.

Can someone give me some insights in what he can expect as bandwidth cost ? (I've advised him to buy a cheap $5 VPS from Digital Ocean).

Thanks