If like me, you don't know one end of paintshop from the other, then I definitely recommend you invest some money on designers. I understand that going down the designer route is expensive, but take a look at the following: The cover on the left was designed by me and the cover on the right was designed by Ida at Amygdala Designs
So spend a little and hopefully people will pick up your book. You don't even have to spend a lot. Amgdala Designs sells 'off the shelf' covers for a very reasonable price. The Book Cover Designer also handles one off covers at reasonable rates. Check out the message threads on Goodreads to discover the best, most reasonably priced sites and take the plunge. Your book sales will be glad you did.