Its looking good, but since you are asking for suggestions there are a few things you could do depending on how far you want it to go.
This might just be a render settings thing, but the blade of the sword seems to be clashing in this render. You have so many touches of metal on the skulls and hilt that the blade seems to be made of green stone in comparison.
Try hitting the thread stitching on the gloves, vest and hood with a different color the way you did with the leather straps (which are fantastic btw). It probably shouldn't shift too much, not contrast stitching, but as it stands it looks more like a stamp than a separate material.
Maybe make some more tonal shifts in the skin into the blue range for blood vessels under the skin if you are feeling up to it, its of course a taste thing but it ramps up the depth of the skin and realism aspect a lot. The leather straps are so very detailed that they seem more realistic than the skin around them. Only bother with this if you intend the model to be viewed up close of course.
And yeah maybe try bumping the knees back a little bit. I don't find them too distracting as it is, but the leggings would be crazy tight like this, more like tight stockings. They do not appear to be placed wrong, but the heels are making it very hard to judge that.
Again, its looking good.