Could you give some advice plz

[Antylum]

Have a little experience in pixelart, love learning in process 
Give me some critique plz: is it better to shade body with black, like on my picture now, or play with HSL with present colors?
How it looks overall?

[HarveyDentMustDie]

I really can't guess what this is. I can only recognize feet, and big breasts. It would be helpful if you could explain your idea, and concept.

[Antylum]

It's a laughing woman with octopus arms(tentacles without suction cups) or like another underwater creature, or fish fins

Question is more about what looks better in pixelart: besides black outline, shading inner parts of the body also with black, or using some darker values of body colors?

[HarveyDentMustDie]

Your main problems here are concept (basic drawing) and colors you chose (they make your sprite look like a brown blob). In my opinion if sprite is done in small resolution you shouldn't use black outline cause you have limited number of pixels that you can use for whole sprite. Instead you should use those pixels for making form of your sprite better. I did quick edit just so you can see the difference. I prefer shading with different colors. I hope that this was helpful.

[Pix3M]

My attempt at another color scheme that hopefully avoids racist implications.



Background is very dark to avoid overpowering the subject. I can't get the underwear to be anything but lighter than everything else while still being a very strong red, but an attempt is an attempt.

[HarveyDentMustDie]

My attempt at another color scheme that hopefully avoids racist implications.

That didn't even crossed my mind. I change colors spontaneously, cause black and dark brown was hard to read. I can't believe that this could've become "the racist edit". 

[AlcopopStar]

It looks like this character would topple over immediately. If your going for large breasts + octopus maybe look as ursula as a reference? if you going for stick thin as well then the character is basically always going to look awkward and absurd. Maybe that's you intention though I don't know.

I would suggest pixeling something a bit larger to give yourself more space to work with, once you have a coherent design or idea down you can work on a smaller version.

[Antylum]

Thanks for help! Your picture looks more sexy  The pose is more stretchful, elastic.
I wanted to create more brutal  woman, like 'Big mommy' http://www.mannythemovieguy.com/images/big_mommas_house_3_movie.jpg
but a bit sweety

I edited a little with softer shading(before/after):

ursula as a reference

Yes, I like it! Something like that, but with human legs

P.S. In which program do you animate pixelart?

[FRAWG]

Readability is still an issue with your latest edit. The colors are so close in hue, saturation, and value that at a glance it is difficult to tell the difference between them. The magenta sticks out a little, but it is still rough and the outlining is a bit unnecessary. With something that small, a complete outline (whether black or otherwise) takes away from what could be there in the image

[Decroded]

I think you should try drawing and posting it larger first so you can be clearer about what exactly is going on in your design.
Then you have a good reference for reducing it down.
We should treat size restrictions as a challenge to portray forms, not an excuse to be ambiguous.