How do you say "be brave" in Russian?

Question

I'm planning to learn Russian as part of a linguistics degree in a year's time, but unfortunately I'm not there yet, and I need this phrase translating for a piece of artwork. Cyrillic script is fine. I don't know how to form the imperative voice in Russian, nor do I trust online dictionaries to give me the correct translation of "brave", so any help will be much appreciated! 10 points.

Answer 1

Who do you say it to - male, female or just in general?

I'll edit my answer once you provide the information

Answer 2

ne padai dukhom - spoken language (colloquialism)if you need metaphrase then - bud' sil'nym/sil'noi(second for feminine). Apostrophe makes the prevous letter soft(apostrophe is used only in  writting russian with english letters)

будь храброй! ( bud' khrabroi !)

Answer 3

I would say

смелее! [pronounced smelEe] - be brave!