Mermaids!
I've never thought about octopus-maids before... Kudos!
One criticism, if you wish to hear it, is the proportion of your ladies, especially the arms.
Have you ever just stood and looked at someone for a while? Granted, you seem a bit creepy (especially if you don't know them), but I've found it helps me make sense of the human body. Or look at a biology or anatomy book - plenty of diagrams about how things are attached :D
Unless this is all an artistic choice, in which case, have at it!
But either way, I'd love to see more of your artwork! What other sea-life would combine well, do you think?