I'm tired and I want to sleep so I wont go into much detail, but there is an option on the d70 to switch gridlines on ( or something similar ). I would highly recommend you try that as one of the most obvious problems when you're doing any sort of landscape/scenery shot is a tilted horizon.
Having the grid on lets you line everything up correctly before you shoot which means less time in Photoshop saying 'free rotate .90 degrees.. too little . rotate .95 degrees... too much..'
I'm sure someone else will give a much clearer analysis of your shots.. probably wednesday morning though...
