Pleasure should always be the deciding factor when buying a picture. It is only by satisfying this purely subjective need, and having to live with the result, that you can build up a really interesting collection. It is for this reason that collectors will constantly rehang or sell part of their collection in exchange for new acquisitions. For an individuals taste is constantly developing, this development should be based upon the attitude that all pictures are interesting, but some are more interesting than others. As the eye becomes more experienced it should be constantly appreciating good quality in mediocre paintings whilst marvelling at, when possible buying, paintings which fulfil all expectations.