Mermaid art help

[NikitaDrizhenko]

Hey guys. I new here, on CrimsonDaggers forums. I'd like to hear your critique towards my last artwork, because I totally stucked and feel exhausted. I started a Mermaid art like a two weeks ago, and the main idea was a show mermiad, who jumps from the water, during a shipfight in the ocean, and catches the sailors, who are falling over the ships. First sketches showing the scene from underwater, but I throw out this idea during the work process. Don't know why I did this, as I see now, they were not so bad as last attempts. I can't find appropriate pose for mrmaid, or deal in the composition dunno. Hope for your help. 
Cheers .