Help!

I need sewing tips from more people more experienced. I am making these trousers:


Here is what I need help with:
How far down is too far down for the crotch? In this picture, I don't feel it looks too low, but it's about 1 1/2 inches from where pants normally sit on me.I also had issues with the zipper and waistband as well as the darts above the buttocks. I have more questions and pictures of the project on my blog.



Any and all help will be greatly appreciated!!