What's the Name of That Book??? discussion

I remember that in the first book, the main female character was a painter and her painting ended up being able to transport people to different worlds. And another female character, covered more in either the second or third book, was a mermaid who left her pod to join them on this quest of theirs. One plot detail was that all three females went to go shopping and were advising the mermaid on how to tell the guy she loved, that she loved him. There were some more mature scenes in each book.
I read the book from either 2015 to 2018. The book wasn't too old, fairly new I think. The book setting was modern, more country than city. One distinct thing I remember is that each cover of the book had a very artistic design, super nice to look at.

Stars of Fortune (book 1) and Bay of Sighs (book 2) of The Guardians Trilogy by Nora Roberts?

Google search of Goodreads:
site:goodreads.com "fantasy" series "painter" "painting" "mermaid"