Word Usage – Difference Between ‘Image’ and ‘Picture’

"Whole" here is used literally: the entire thing, the undivided unit. The "whole picture" means "everything you can see".

I presume the characters here are women. One has bought a new bag, and she is saying that carrying this bag will make her look more attractive to men, even though a man would be unlikely to say, "wow, that's a very pretty bag". Men "respond to the whole picture, even if they don't know why". That is, a man will see a woman with all the facets that go into her appearance -- her shape, her hair style, her clothes, and, yes, her bag -- and make a judgment about how pretty she is, without thinking of the individual components.

One could debate if that's true, but this is a forum about grammar and not dating advice.

The mean bugs are mean because they are chasing the little girl (presumably to sting her, perhaps). They are mean because mean can mean “cruel” or “unkind" or “unfriendly”.

The buggy bug is buggy because he is in the boy’s hair. To “bug” someone is to bother or irk that person, so “buggy” can be defined as “bothersome” or “annoying.”