Use the sliders to open the attributes panel and select as many attributes as you like.
Select all of the attributes that you your results MUST have.
Within a box, selecting a single attribute means "Only bases with this attribute." For example, selecting "Female" in the "Gender" box means "Find Female bases only", but selecting "Female" and "Male" means "Either Male or Female bases are ok."
If you select "Female" in the"Gender" box, and "100% original work." in the Originality box, your results will contain only bases which the artist has specified as both female and 100% original work.
If you don't care about any attributes in a box, just don't select anything. For example, not selecting a shading type means that results will contain ALL shading types.