Hi there!
I'm Nico, an experienced artist in both digital and traditional art techniques and any artstyle from realistic to cartoon. I've made cover arts for books and music albums (one of them is post-apocalyptic), posters, clothing designs, concept art for videogames, website backgrounds, etc, and most of those artworks are sci-fi.
I have the majority of my artworks posted on my portfolio in freelancer.com, but I can send you my portfolio in PDF if you want. I've divided my offer in the four factions you mentioned, one milestone per concept! If you find that the final price is too high, feel free to discuss it with me! As I have to make a living from my work, but also do you, so I'd like to find a fair number for both of us (note that I'm not asking for more, just to lower it if you really need to).
About my professional qualities, I'm really perfectionist and like to do my images as perfect and close as possible to the client's demand. I'm constantly asking about details, showing the work in progress, and working hard to finish on time without losing quality.
Looking forward to hear from you! Nico.