There doesn't seem to be a general forum area so I'll post this question here. I'm growing a garden for the first time and things are going well. I have 2 tomato plants that are starting to flower and for small fruits. Ive noticed a few leaves are shriveled and dying. Is this usually from too much water or not enough? I've attached a photo of a leaf.

Shot at 2007-07-29

Shot at 2007-07-29