yep, the elbow is ok, it need as you said just a bit improvement nothing important, the problem is with the legs, a@@ and foot position from my point of view, tested with various animations, mocap and handly maded 
the upside of the body seem’s ok, i didn’t tested complex animation but i think is important that the most basic animations works fine (idle, walk, run, crouch, jump atleast) and i found some problem just with the crouch one with lower body deformation and overlap, didn’t tested the jump to be honest but seem’s fine from your ALS video.
after all the “small” problem are fixed up i will suggest you to publish this product to an higher price, actually there is some problem but i’m sure that you can fix this and the quality will be just a triple AAA.
i’m talking honestly, there is only one product on the marketplace that seems has been abandoned, if you can release a “clean/working” product be sure to sell a lot.
i think the most important things are:
- fixing the downside of the body (weights right? i’m not a 3d designer)
- fixing the runtime problem mentioned from you previosly, i’ve replicated it, it happens when you remove and add again the ponytails with a running animation for example
- fixing if possibile the UV difference from head-body and other body parts (is noticeable)
- try to make it integrable easily with other system (simplify the reference for replacing character_bp for example or remove it entirely and split it with two master blueprint: male and female – see added question for reference)
- integrate the FBX for let us create some clothes
Added Question:
also i don’t understand why is present a master blueprint and two child blueprint (one woman and one man), it will be not better to have one master woman and one master male blueprint? the skeleton as you said before is different (and if it is not then is better only one blueprint). Also this can cause some problem when you need to spawn it in a multiplayer environment because something is defined in the character_bp and something else in the female/male blueprint. i think using two different master blueprint will be better, let me know if i’m wrong and why 
PS: Edited.