Open doors and windows and it will help. Paint smells don't leave for a while especially if it has just been done recently. So continue using the fan even if you don't think it works, it will move the air around. With windows and doors open if you can and the fan it will all help there is no magic way to get rid of that smell.
For more you can refer to this site.
http://www.huffingtonpost.com/2012/11/07/how-to-remove-paint-odor-with-an-onion_n_2089433.html