The main issue is inconsistent limb length as well as other proportions, i would suggest practice simpler poses with classic proportions.
This latest one has short-looking arms.
When you use DesignDoll, are you using it to understand the structure, or to copy from? If the latter, then it's quite easy to accidentally create inconsistent or incorrect proportions because you might render parts of the body in way that make them look like they're at a different angle than the ref. Poorly done foreshortening can lead to wonky limbs, and DesignDoll, being 3D software, will almost always have some foreshortening somewhere that you might not be noticing and therefore not depicting clearly.
In addition to that, with pixel art you don't have room for the subtler details that make things look right. The difference between an arm being too long or too short could be a single pixel, where exactly you put the sleeve can determine whether the arm looks foreshortened or not, and so on.
shes about to fall
That other dude also does anime pose but comes more as he is humping stuff
i told you to get handle of basic positioning and perspective because now it looks like cargo cult imitation of fighting game/anime sprites, and im more than sure people who drew them studied anatomy and drew from live sources first.
Here comes the guy that struggles alot with the same problem.
My Photoshop Teacher always told me to simpliefy everything until you cant simplify anymore (Like turning everything into cylinders or making a ,,low poly net'' for the form to know how things are bend and will cast a shadow)
Pixelart of curse is a little diffrent...
Still you can always siemplyfy things...cut it down into triangels or round shapes (the easy things in pixelart)
And keep in mind...most of thetime ther is no ,,core shine'' (a shine in the middle and small black outlines) But the is a always a ,,core-shadow'' (very dark shadow with light at both sides)
So Take a VERY dark color and start where the most domiant shadow and then refine it (really just put big part into shadow...cellshading doesnt stop at the line where a normal shadow woud blur...it stops when the light begins...)
PS: I will follow with a edit but for some Reason that image is a gif...so i have to edit in PS (Graphics Gale cant open it >.>)
How specifically? Is the pose unbalanced? How so? It's clear I'm not getting why I'm having these sorts of problems.It is unbalanced, her legs are sliding apart and her feet are stumps.