It is possible to be so proud of the effort it took to make your art that you become blinded to the (lack of) quality of the finished product. What you see when you look at it is the culmination of many hours of difficult work, far better than what you could have produced before you started. What everyone else sees is a painting of a two-dimensional dog with weird proportions.
Mokalus of Borg
PS - I always worry about this with my own artistic efforts, no matter their type.
PPS - Lately, of course, it's my writing.