One more story from the bio... it seems that Arbus was teaching a small class or an individual student at the Coney Island amusement park... she said if you look at the face of all the horses on the merry-go-round (carousel), you will find that each one is different!!
Sometimes what you hear at workshops is that in order to be recognised (i.e. good at what you do) you need to be somewhat consistant, however... too ridged and the creative spark goes out... too broad and you never hone your skill or artistic eye.
I think it's a good idea to keep a portfolio tucked away somewhere (maybe a sub-selection of the best of each year). Possibly 4-5 per year as a reference base so that you can see how you are evolving (or not, in which case get a move on...