What could these buggies be?

[beeskwared]

Hi folks!
First post! Yay...

We've been noticing on a couple of our tomato plants that many of the lower leaves have little pinholes all over them. Upon closer examination, I noticed a couple of different kinds of insects on the leaves.

One type of insect (first bug image) has the look of a tiny little tick or something. I've been finding a few here and there, but strangely not near the holes.

Another type of insect (second bug image) appears on the underside in the vicinity of the holes in question.

I could spray or hose them all off, but I'm reluctant to until I know what these are, and whether or not one type might actually be beneficial.

Any ideas? I can't seem to find any matches online...

Thanks so much!
Brian