Most importantly, where in the US do you live/what is your USDA growing zone? Very hard to give advice without knowing your climate. And how is your soil, do you think? And what is your watering schedule?
The first pic, not really sure. Possibly deficient soil, possibly watering issue (most likely over- or too-frequent watering.)
Second photo of your tomatoes, I see signs of early blight. Those brown and yellow spots on the lower leaves. Extremely common (it's in my garden). Hard to eradicate but can be managed; do a search on early blight. Some types of heirloom tomatoes are particularly prone to it as I am finding out!