First of all, take everything I say with a grain of salt because I am a fitting fanatic when it comes to pants. I've been known to alter seam allowances by 1/8" just to get the fit exactly right, so it's my equivalent of Angie's PPL.
Judging from the pictures (which is always hard because you don't see the 3D body shape) these pants are ALMOST perfect except for the pooling around the back which others have noted. Part of the problem to my eye is that the crotch (we are using that word a lot around here these days!) does not drop down low enough to keep the fabric from bunching around the seat and upper thigh area. Slouchy is good, but, in my books, bunching looks bad.
If this was a fitting muslin, I'd be adding an extra 1/2"-1" to the FRONT seam to allow the crotch point to drop a bit further so the extra fabric at the back could drape without bunching. Women with flat abdomens can sometimes get this extra length by belting in such a way so the pants will hang lower in the front. If neither of these options are realistic, you have to adjust the back seam so that the curve of the centre back seam is more shallow and less pronounced. The usual way to take out just enough fullness to get a straighter seam so there is less fabric to bunch up at lower portion of the back seam. You don't want a tight fit here; you are just looking to eliminate some of the extra fabric that is pooling around the upper thigh area. Another, more expensive, alteration would be to split the amount you take in between two areas: the lower back seam and the back part of the inner thigh seam. Even a 1/4" in both places would make an enormous difference. If these were my pants, that's probably what I'd do but I wouldn't stitch anything until I had undone the seams, pinned and basted the new seams, and tried on the pants to make sure that I was hitting the sweet spot between slouchy and baggy. It's not a hard tailoring job, but one that requires fitting on your body.
Fitting pants on a woman's body is always interesting because our bodies are so much curvier than a man's body. To me, a good "slouchy" look means a dropped crotch with enough fabric to hide enough of our curves to tease the eye. These pants have that look from the front, but could use just a little tweaking in the back to move them into the fabulous category. If the pants are pricey, it's worth the effort, in my opinion.