My ethos with commissions is to work as closely to the client's vision as is possible; when a client is unsure on exactly what they're looking for, I work with them to discuss in detail what their needs are, and take them through several examples until they are absolutely satisfied. I have not previously advertised for commissions: all previous commissions have been made via word-of-mouth and private recommendation.
My in-house work for House of D has attracted private commissions, and acted as a form of calling-card. I aim to keep a balance between communicating book genre and content clearly and cleanly in cover design, against the desire to make each publication stand out from its fellows and not become lost in a sea of similar genre designs. My preference is for bold, uncluttered work which sticks in the mind.