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It seems like everything is more or less okay with the hip area. (although it depends on what the issue is?)
However, there's a feeling that the torso and "skirt" are stretched too much, but this problem probably existed in the original model as well.
Should we replace the Landlords? If you're interested in my opinion, I once wrote a detailed "work plan" for the creatures of the Empire. For the first creature, it was something like this:
Repaint the peasant's shirt to brown and make him a neutral unit (weaken the characteristics, increase the growth rate).
(Leave the characteristics of the others as they are, only change them visually and in the description.)
Make the unupgraded original Tier 1 unit of the Order faction a militia unit,
and make the upgraded and elite upgraded unit a pikeman model from Heroes 6/7 (with some visual changes and repainting). The idea was to take away their shield and lower the arm in the animation (this is not difficult), and I wanted to do this to make the pikemen stand out more from the armored knights with shields.
The ultimate goal was to transplant the militia model onto the pikeman's skeleton so that all three Tier 1 units would look cohesive, and the unupgraded unit would differ in animation from the neutral peasant. This is more complicated, but in principle, it's not difficult; you could take the model from Heroes 5, but only partially, for example, leave the legs from the model from Heroes 6, and simply change the texture. You could also add some shoulder pads or something similar to the militia unit.
These were the ideas; I'm just sharing them, maybe something will be useful.
In general, "should we replace the Landlords with these guys without changing the characteristics?" Why not? It's a good idea. But I would at least take away their shield and lower the arm in the animation.
By the way, I took a look at the upgraded pikeman model from Heroes 6. It seems that it differs from the unupgraded one mainly in static details (I mean the details that are rigidly attached to one bone and do not "bend" when the animation is played, i.e., the helmet, shield, shoulder pads, etc.). If this is really the case, then creating an upgraded creature based on the ready-made unupgraded one is quite simple in this case. You just need to add details to it. And attaching a "static" detail to the skeleton is very easy, in two clicks.
However, there is one "bending" and very complicated detail - the cloak. But, in general, you can simply ignore it. Re-attaching it using the attachment from the cloak from the model from Heroes 7 would not be difficult if the cloak model from Heroes 6 was in a neutral pose, and not in the starting animation pose. But as it is, it's very complicated, and you either have to fix the position of the cloak from Heroes 6, or just take the cloak from Heroes 7, or do other voodoo magic.
By the way, I advise you to try Substance Painter to render the creature's texture more beautifully and abandon the buggy gloss.