Give the subject a job
The subject should help the reader recognise the topic and the action. “Project review: feedback requested by Friday” is more useful than “Important”. Use a real deadline only when one exists.
Put the reason first
Open with why you are writing. Follow it with the background the reader needs. You can be polite without hiding the request beneath several lines of formal language.
Make the next step clear
Ask for a specific action: a confirmation, a decision, a document or a short meeting. If several people are included, say who needs to respond. Avoid adding unnecessary recipients.
A simple example
Subject: Project presentation — request for feedback. “Hello Professor, I’ve attached the outline for our project presentation. Could you review the problem statement and let us know whether the scope is clear? We plan to practise on Thursday, so feedback by Wednesday would help us revise. Thank you, Ananya.” Adapt the names, timing and request to your situation.
Read it as the recipient
Before sending, check the recipient, attachment and dates. Ask yourself: can this person understand what I need without asking another question? Remove filler and keep the tone respectful.