I use 'painting' always - ONLY when I list in dollhouse miniatures, as that is a common search word under artist's offerings there - too difficult to find otherwise. I don't feel that 'painting' is searched on much - unless maybe 'cat painting' or the like. Just don't know. Also painting takes up too many valuable characters.
I do feel you are missing out if you don't put 'watercolor' if your work is primarily (95%+) watercolor. Watercolor is one of the top 10 search words in art. I do try to put in 'ink' if I have room for it. But not many would search on ink. I would prefer to put SFA (small format art). I am afraid of misrepresenting, too. If artists had to stop putting watercolor just because they added a dob of acrylic for white, or pen, there would be a lot less artwork listed under that. I am quite sure, that adding ink to watercolor washes is quite 'acceptable' to still be listed as watercolors.
I am teaching a watercolor class in a major art gallery over the next month, and will be showing all students how to add ink to watercolor 'sketches'.
WC with ink is more commonly known as 'pen & wash' - in England & Australia, but try that on ebay, and it just doesn't work. Same with some other terminology. It is in the description you need to make it clear.
~Jillian
~Jillian
artist, Jillian Crider
... google me!