Cover art for book - Easy project

I am a writer and need cover art done for my next book. It is a Sci-Fi book so I am looking for particular skills. You will be creating one new work of art for the main page with title and a back cover that will just be a star field. The front cover will have a space ship based on my explanation of the design and one figure from mythology/history in a ghost like persona. I always give credit to the cover designers (see current book which is in the process of being published). I do not always pick the lowest price bidder. I will need examples of artwork (linked or attached to bid) so that I can decide if your technique is good for what I am looking for. Last artist finished the project, was paid and then received a bonus of 40% of their bid! I reward good work. If you do not enclose an actual bid (dollar value) then I will delete your posting. You can ask questions but if you want me to pick you I need to know what your bid is and examples of your work.