Healthy looking plants. They might get taller than your block wall. lol
Next time, space them out more. You can top them to keep them short and bushy.
Im positive the specks on the lower leaves is just mud splatter. Still, it is a good idea to trim off some of the lower growth - it will create more air flow down there. Also, keep an eye out for powdery mildew. It looks like that block wall is going to hinder air flow a bit...