Book covers with great designs needed

I need to have some a bit more than 50 covers done and sent back with the following specifications: -need jpg files format -titles and author name and titles must be two inches within all margins. -need two sets of pictures. 1)6x9 inches and, 2) 2820X4500 pixels -Color needs to be rgb format Will need bright or easy to see colors for the titles. Must be sent via freelancer or www.wetransfer.com.