That looks like thrip or spider mite damage, or some other bug possibly. Look at that leaf very closely, with magnification if you can, to see if you see any tiny little brown/black bugs slowly crawling around. The bugs should be mostly on the undersides of the leaves that have white spots on them. Check your plants very carefully for these bugs and post back whether you could find any or not. If you have spider mites, it is very important to get rid of them as soon as you can and while your plants are still small.
Also what's up with your soil in that last pic, it looks like you just poured a little stream of water around the plant. Is that what you did or am I just seeing shadows here?
If you are just adding a little bit of water every day or every other day that is not good for your plants. When you water make sure you thoroughly soak all the soil until it starts coming out the drainholes in the bottom of your pots. Then don't water the plants again until the top 2 inches of soil is completely dry. You should also be able to feel the weight difference between a dry plant that needs water (light) and a heavy one that has just been watered.
