Haha fair enough x) Still really nice though!!

 I had seen these errors, but I was too lazy to redo the breasts to fix the belly x_x

Hey! Going off what Nightmare said about the anatomy, I think the biggest issue is the torso area.The shape of the body itself looks like it should be forward facing, but the detail of the stomach making it seem as though you wanted her to be leaning to the side I think? You might want to think about having her right waist (our left) curve in much more, and her left stick out accordingly so her stomach looks more like its in the middle from that angle : )

Also I think maybe the 'knees' of the fish tail could possibly be improved? The way I personally would go about it is by sketching out regular human legs first and then drawing over it to get the shape right. As it is the top section seems to go on for too long, and it kinda sticks out at the joint which looks a bit odd.

But really nice colouring work! I really like the way you shaded the clouds in particular, it looks really effective

ps. if none of what I said makes sense tell me and i can redline : }

 The lines of the underside of the left breast seem a bit jagged. Aside from that, it looks good 

 Thanks for the tips :D the website that made ​​this promotion is this: http://www.pixelaria.org/

The background looks really good, especially the rocks and clouds.

The mermaid herself could use a little more work, her overall anatomy seems a bit off (can't quite put my finger on it, though).

May I ask, wich brazilian pixel art site you made this for?

 So she sweats a lot, hum? Just kidding, this is good.

Nice work! cute colors :-)