Kunstenaars is plural for both male and female?
kunstenaar = m. artist (pl. kunstenaars)
kunstenares = f. artist (pl. kunstenaressen)
Yes, but if there are both male and female artists, then is it kunstenaars?
This statement is categorically not true. Have you ever met an artist Duo? I think not.
What is the difference between this and "de kunstenaars werken 's ochtends"?
It is my belief that "in de ochtend" can mean either (habitually) in the mornings or in one particular morning, while "'s ochtends" means only (habitually) in the mornings. But I look forward to anyone with a better handle on it to add/correct.
There is ambiguity here. One morning or every morning?
Could be either in Dutch as well.
What's the difference between ochtend and morgen?
There is a good discussion here:
The correct selections for the answer are not in the selection so it is impossible to answer correctly