NueB ,I,m not trying to rain on your parade dude,I really admire your work.But the example I have given above applies to most if not all works of art held in museums around the world,the Brooklyn is only an example.
I worked full time for Museums and galleries for six years and I know what I know.The era or style doesn't come into it either whether rennaisance,pre-raphaelite or cubist,in my city which is one of the only ones worldwide where entry is free to all venues due to it being public money which is used to fund and purchase works,the galleries own copyright.
Also,I believe the creative commons deed in this case applies to reproductions purchased from the gallery,heck they charge $25 for a jpeg for research and academical purposes,this is under attribution.
And you cant just choose which part of the deed suits you.It's all applicable
Quote: "to Share — to copy, distribute and transmit the work.
Under the following conditions:
Attribution. You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
Noncommercial. You may not use this work for commercial purposes.
No Derivative Works. You may not alter, transform, or build upon this work"
Anyway go ahead and sell em if you want,it's not really my problem.
best rolfy.