I find it rather difficult: for example, I shoot nearly exclusively wildlife and the pictures which are sold very often are the less interesting ones (from my point of view..) , it depends of what this particular customer was looking for. Quality of the picture of course, the subject isolated (even this rule doesn´t apply always).. You get often surprised when a picture is sold because often it may be a photo which you expected DT even to reject! Wish you the best of lucks!
