Your plants look healthy to me…
That brownspot is likely a sunburn from water droplets on a midday…
If you haven’t started, it’s a good time to start giving plants nitrogen…
Organic Nitrogen sources include but not limited to cow dung, chicken manure, goat manure compost, vermi compost, compost tea etc…
Or you can just put all your vegetable scraps into a bucket and add some soil from under the biggest tree in your area (this inoculates the water with bacterias that will help digest the organic material and convert it into liquid gold aka fertilizer ) and add water and leave it for a week and then dilute it and use it too…
I don’t know about the insect though, but I’m sure someone would chime in whether that’s a predator or pest 
Happy growing brother… 
