Possible Clues:

• A sedentary baby minder
• Many a vacationer's need
• The one whose picture it is can't stand it
• A portrait painter can hardly miss something like this
• The portrait painter can hardly fail to make a hit with one
• Artist's model or child's minder
• The artist could hardly miss doing a portrait of this
• Artist's model - an easy catch
• The portrait painter could hardly miss it, but needs one
• The portrait painter just can't miss having a shot at this