the mermaid on the left seems like she is falling to me, I think its because of the hair.
I perceive her to be going north, but her hair should also convey that sense of direction, how it is right now I cant say seems like she is in water.
the mermaid on the right seems much more believable as to where she is (in the water) and like Camreb said her arms do seem a bit static. It also seems to me that they might be having a conversation if that was what you were trying to portray then putting her hands behind her head or make her hands motion the backstroke swimming style.
I liked the color of your second post and I do like the idea, the hand fins, and how long their tail is.
It is a little hard to read as an illustration (the large area of bright white is distracting), as it is in the water, you could have sea life or plants covering up the parts you think aren't quite rite. Obviously you want to practice your structure and form, but maybe in another picture. Yin and Yang is an interesting idea. Or is it Ying and Yan? Maybe you could have a male and female mermaid. Well, why not? Maybe two sets of twins. lol
hey! thanks for all your comment, I re-loocked at my first sketch of this project, and yes, I lost a lot of motion during the process, in this skech it look more like a parade, one standing ans the other turning around, I lost the "art nouveau" style too, but it's less readable, and yes it's a boat ...
@AkashdeepHehar: yes for the hair I was stuck in the first version, where she is just floating,
@RFalconeArt: for the large white area, it was my fisrt wish to do some heu... backlight(?) (contre-jour in french I dont know how to translate it) to practice translucency, but you totaly right it's mega bright
so voila, I dont go futher with this illustration, but you can still critique it, I apreciate it, thank you, see you soon for a new project
well, the sketch is better. Maybe you should do a straight up erotic picture -- the mermaid/cartoon concept doesn't seem quite right with your emphasized breasts. In general, you don't really want to do an intricate rendering of nipples. It's not an anatomical study, just my take, I have a degree in Fashion Illustration.