A specific criteria to be most likely can not. What to measure something ?
ROI As sprat in banks? 50%bush - perfect for 150%- so do super ?
"Not suitable means such an assessment. How can we evaluate the cost of painting?
Measure the amount? So, again the same. For some, and a picture of the month - is already a success, but someone 15 - little ... And then five years later the man who sold a month, selling 15. So then, 5 years ago with one picture - it was a successful sale or not?
You can also estimate the probability of those lacking it to life with the sales. But here, everyone has different criteria, depending on who he loves the bread smeared ...
So most probably the correct assessment would be purely personal, just at this time to a particular sale.