The angular cuisses and arm part of the pauldrons make a very odd combination with more smooth and rounded curves on the breastplate. I think it makes it lose some of the cohesion as a whole.
Usually, when there's an attachment point on the cuirass for cuisses it's a hinge, so that it can be taken off, not riveted, making it a single piece, hard to put on.
On a side note, I recommend you to look into late XVI or early XVII century armours, they have some interesting designs for waist-hip area.
Mixing something like these two might yield some interesting results.
Similar note about the connection between greaves and poleyn, the last portion of the latter usually has a tight fit to the upper part of the greave with a catch.
On the gauntlets the first hand piece goes under (inside) the neck of the gauntlet.
Speaking of tight fit, couters.
The hole between gorget/bevor and breastplate is very off-putting, I think smoothing that part into a flat prior to them overlapping would make it look like a better fit.
Also, I would add more segments on her sabatons/boots for better articulation.
I like the bat/vampire theme going on, with flaring pieces, but right now they impede functions of what is a tool first and foremost, when the form should follow function.
Oh, one last thing, if you're straying from the original design, I think adding some padding on some pieces would look very nice in pitch black velvet or something similar.
