I generally think of the full output of an artist as their "body of work." Sometimes individual works by a particular artist may not be that interesting, but in the context of their full body of work, they may have meaning that they don't have on their own, because they may contrast with other works, or show the artist's progression over time, or they may reveal a theme that can only be recognized when comparing several works.
Usually one wouldn't say "I have created a body of work...," unless that person were reflecting on a long period of creation. A body of work is something that happens or emerges, but isn't really like a "project" that is created over a short, well defined time period.
Sometimes you might say that a group of artists produces a body of work over time.
It's not that obscure a concept, and it doesn't imply any sort of value judgment--just a quantity of sustained output over time that has some coherence.