There are several ways to find models. Relatives and friends might be easy to access, but they are not necessarily good models. Another possibility is to use special web sites where models and photographers find each other. Make-up artists can be found the same way.
Another popular site is http://www.eye-on.net (former photograaf.be). Current list is above 800 models. The site is in Dutch. It is supposed to grow beyond a basic meeting place for photographers and models, but these services are yet to be developed.
Less popular is http://models.handelsgids.be/?zoekenHome/
Very popular international site: http://www.modelmayhem.com. It is not so popular in Belgium (only 300 models) as it is in some other countries, but is it a good resource for photographers. The site is in English.
Site popular in Germany: http://www.model-kartei.de. It lists more than 20,000 models, and on top many make-up artists, studios for hire, etc. Although the site is in German it is quite easy to search for models if you learn a few basic words.
Speaking about Dutch sites I forgotten to mention very popular site http://DutchHeaven.nl