baby tomato plants

Things do not look promising for growing Tomato plants on my balcony. I've moved them all up into little pots, and they look like they're doing fine.

Until I compare them to the one seedling I gave my daughter to put in her garden plot. It's been sitting in her windowsill (full sun) here in the apartment for the time being. In spite of being neglected with watering, it is far more robust in growth and has better green color than any of my tomato plants out on the balcony.

So I think I just don't get enough light here for tomatoes. If the plants do mature, they likely will not ripen...