Brown leaf edges mean ran short of water. Since on older leaves, that was a while ago.

Bleached areas between veins (#6) indicates environmental stress, likely warm, dry day with bright sun.

The bright yellow veins (#3) on the one leaf remind me of herbicide damage. but since it's only one leaf, probably not.

Overall, also a bit pale -- using any fertilizer yet?

Yes, I am fertilizing (both MG and fish emulsion). Most squash and cukes have pale, yellow leaves. Not all though.

Careful not to give them too much nitrogen.

Look for squash bug activity, especially nymphs, on the bottomsides of the leaves.

I've seen them cause leaf damage similar to some of your photos.

Here is a link that might be useful: Squash Bug Photos