Dear expert,
I wanna ask you for a favour. Can you correct my essay please (10 pages with pictures)
Thank you.
Sincerely yours
Felix
Sure,
just send it to me: [email protected]
Dear Felix,
as cruel as it may sound, I usually get paid for this amount of work. 
If you’re willing to invest a few €, I’ll help you asap. Otherwise, good luck.
Best wishes,
Vanita