Suzanne,
It really depends on how much work you want to put into marketing your images and increasing your quantity of images. FAA is just a shelf, in a giant store, filled with hundreds of other shelves. YOU need to get people into that giant store and "find" your shelf and that ain't easy!
There are NO guarantees here, whether you are here free or as a paying artist.
If this is a "hobby" and you enjoy keeping it as such, then take your time and add images and enter a few contests and see how you do,
Good Luck,
Rich