Well, cuz I just wasn't happy with them. I am thinking that for my next series I will be seeking someone to design the covers for me. I love the design process, but I just don't have the time anymore that they require. I'd rather write ;)
If anyone has good references, please let me know as I will be on the hunt. (lol...hunt)
In case you haven't seen them...
They are also up on my Divisa tab and on Goodreads.