first picture just looks like a couple green bumps. Do they move? Do they have legs? Are you thinking they are insects? Second picture is some kind of teeny tiny insect, looking pretty harmless. In both cases, is any damage being done? The plants look healthy.
You can't start worrying about every bump and tiny insect; nature is FULL of them. The time to worry is if significant damage is being done.
The third picture looks like probably a bit of septoria, a fungal disease that tomato plants are very prone to. By this time in the season, in humid climates, it is almost inevitable that they will have bit of it. Just cut off and trash (not in the compost pile) any leaves that are showing the brown spots. It helps to mulch well to create a barrier between the soil and the plant, only water the soil, not the leaves, and cut off any bottom leaves that might touch the soil. You probably have not much more than a month left in your tomato season. Practice good hygiene and your plants should make it through until then.
It's nature. If you want pristine plants with no bugs or marks, get a hydroponics set up indoors.
And don't start thinking about "eradicating" all the little bugs. 1) it's impossible 2) MANY of them are beneficial in the garden and prey on / parasitize etc, the ones you don't want 3) if you start using poisons, you get rid of all the beneficials and then the bad bugs take over.