Thanks for your interest, but as mentioned in the title and the post we are a RevShare project so at the moment we don't have a budget to hire anyone. Also we are going for a very simple art style exactly because we want to produce the images quickly, we got so much art to do and we want to finish it in a year. As such our artists try to use no more than 2 hours per piece.
This is probably not something that appeals to everyone, but if someone feels they can deliver around the same quality as the examples I posted in that time frame and they want to have their name in the credits of a card game on steam, then contact us.