#4,5 and 8 have some cam shake which degrades them.
Use a remote release or the cam timer.
Take more than one shot and go with the best.
Weigh the tripod down to make more stable.
It also looks like aperture setting was too low and not near the lens sweet spot which is generally between f/5.6-8.0 on most lens. Each lens varies; find the one for yours and try to shoot near it or stopped up a bit for more depth if possible.
Shots #1,3,6 and 7 came out nicely