Mes amies, I have for you today another infographic for your perusal. (Remember the one I did on plot.) This one gives you a handy chart for determining whether you're ready to query.
As always, please let me know if you have anything to add, or find any mistakes.
Update: SO SORRY for spacing out and not uploading the ACTUAL thing. This is, well...yes. Ahem. Here it is.
(click to make bigger -- or click here to download as a nice clean PDF [the way I intended it])