Learn English – For your information or for your kind information

To look down upon someone (or look down on someone) is to view them as inferior. (The reverse is to look up to someone, which is to admire them.) One's own kind is other people who are like oneself.

Assuming you are referring to the passage from Chetan Bhagat's Revolution 2020, Gopal has just used the phrase "other losers" in reference to other (hypothetical) people in the same position as him; by saying "Don't look down upon your own kind", Vineet is reminding him that, since he's in the same position, he is no better than they.

It depends on how formal/informal the situation, and by extension, the email is.

For a formal setting, you could use:

Hi [...]

Please find attached the requested pictures and information, for your reference. Please let me know if anything else is needed/required.

Thank you, [...]

For an informal setting, anything simpler goes:

Dear [...],

Here are the pictures and links you were looking for.

Look up some in-depth strategies on writing formal letters here. It might help.