Personally I think you should have more details listed, so your spriters have a better Idea of what you are looking for. It would also be a good idea to list what size or sizes are acceptable to you for tiles, What do you prefer? 8X8, 12X12, 16x16, other? Are the sprites black and white or grayscale? If they are grayscale, how many shades (3/4)? What sizes are acceptable for enemies so that they fit on your battle screen?

Other stuff:
Descriptions of main char and party members
Example:
Kain.
Kain is a main character. He is a knight that wears heavy armor and uses spears.

Descriptions of enemies
Examples:
Bat
A normal bat

Thunder Demos:
Boss monster. A large demon with one eye. Has a single horn and wings.

 
You should also plan your over world out so spriters have an idea of what you want. For example:
Areas:
Evil forest
Serene beach
Main castle
Never-ending desert

etc. etc.

You could list all this out at once or as you require certain parts. The more information and detail you give the better quality sprites you'll get. If you haven't gotten very far in your planning yet perhaps its a bit early to post a sprite request thread.

Just my thoughts anyhow.

Thanks for the tip. I'll list them here:
Its an action RPG, so the enemies are the same size as the main character, 16x16.
Its only B&W
Ryan (main character)
He's a Hikarii knight, and wears a light armor. He uses a kite shield.(http://i.ehow.com/images/a04/em/ga/kite-shield-800X800.jpg)
King Travan:
He wears a sceptre in his right hand and wears a cape.
Lord Copar:
He wears a heavy armor and has a black cape and hood.
Lord Copar's knights:
Heavily armored, square shield
Other enemies:
A wolf
A lobster with 4 claws
A ghost


More coming soon...

I think everybody is just too busy atm.
Exams, school, projects, etc...

I guess it also can take some time to get an answer.

I've been working on a few, but I'm not the best pixel-artist, and I've never played FF:QFR, but here are King Travan, a ghost, Lord Copar, and a wolf.

Wow they look cool!

And actually, FF:QfR does not exist Its my own version of FF Adventure.