Hello, I'm an artist and student of game development. I will need a week for each item of the game, for example one week for the backgrond, one week for the principal character and etc. Everyday I send you the process and you say if it's great or not, and depending of the complexity of the item, I will need more time to do it. I can do a simple character in one day but I'll take one week or more to animate it.