You might draw more interest(and thus more potential pixel-artists) if you put some basic info of what you hope the game to accomplish. Even if it's not directly relevant to the job you're asking about, getting people interested at all might be good. Also you could make the thread a more general thing for other jobs you need or for info on releases over time, perhaps.
EDIT: Also, some screenshots, if you've got mockups(since obviously you probably don't have final versions given you need an artist), or details about what steps you've already taken yourself or with anyone else working on it with you would be nice to see.