I also realized (a little late) that I should have chosen a different sunny spot - the shadow of the house very quickly threatened to overtake the whole piece of cloth - but luckily, my daughter's came home from school and were able to help me move the table further out.
Below is how the cloth looked after it dried in the sun and all the salt and leaves were removed. You can see how the places where the leaves blocked the sun turn white.
Here is a close up of one area where you can see a part of a fern, an ivy leaf, and many speckles from the salt.
More importantly, I learned a few things about sun printing: have more objects than you think you'll need, give yourself plenty of room away from any encroaching shadows, and results might be better if you use paper cut-outs of shapes rather than leaves and ferns that curl up and away from the fabric, making less clear prints. Anyway, it was a nice excuse to be outside in the sunshine clipping leaves and playing with paint!