They look good to me for first pens. (See the thread on First Pens here to see where some of the rest of us started.)
Ideas for improvement...
One way to go is to work on other finishes. Are you using a friction finish (aka turner's finish)? CA or lacquer can get you a higher gloss and a more durable finish. You can get lots of ideas in the Finishing forum here. You'll find a bunch of ways to do CA finishes - none of them will work for you, but if you try them all, you'll probably figure out yet another way to do it, which will work for you.
Another thing to do is ditch the kit center bands. I see you trying to turn creative shapes... the CB just gets in the way. You can make slimlines without center bands, or make your own center bands. It's probably the easiest "mod" available for slimlines.
Of course, doing more different kits is a good way to expand your experience, too.
Pricing... that's a huge thing that no one can answer for you. It all depends what you're selling, who you're selling it to, where you're selling it, why you're selling it, and what kind of salesman you are. There are some threads in the Marketing forum about this that can give you some ideas. Also search on-line to see what other penturners are charging in their online stores or at Etsy.
Good luck, and welcome to the addiction!