Your domain name should also be your site title. Search engines will add value to your site if your domain name is in your site tile.
Bare in mind that using a keyword based domain name does not individualizing the work. A site with the name Encaustic Sculpture could be any ones work. Perhaps it is a site that collects images of work by all encaustic sculptors. It is for this reason that I chose not to use it as my main domain name.
If you feel strongly about using keywords in your domain name consider a name that includes both your name and your keyword. For example I could register the domain name KimBruceEncausticSculpture.com but I won’t because I think it is to long and hard to explain. See Tip #7