Info about cover photo for series

I still want an original cover, and I had spoken with a friend who is amazing when it comes to art. I'm waiting to see what he comes up with for the series, but in the mean time I found a website that already has premade covers [for a price]. I'm really excited now. When my friend comes up with his sketch, I want to change my cover {of course). Anyway, I am really pumped up!!!!!!!!! Oh yeah!!!!!