Kostman’s original painting of Rosati was not a very accurate portrait.
Conclusion
Your reproduction of K's painting of R will not be a very accurate production of the painting.
Evidence
K's original painting of R was not a very accurate portrait.
Evaluate
This argument is wicked dumb. It's saying,
Since "not very accurate" is being recycled from the Premise into the Conclusion, it has the feel of the famous Part vs. Whole flaw, in which an author thinks that a trait belonging to one must therefore belong to the other.
In this case, though, the relationship isn't Part vs. Whole, it's Original vs. Reproduction.
If the original had a certain quality then the reproduction will have the same quality.
Goal
Let's look for an answer where it's saying, .