On paintings they do, because painters are often perverts. But in The Bible Angels always appear as men in shiny clothes, so not naked.
Sometimes they also wear armor such as the arch Angel Michael.
No
no
Yes
yes
No .
Yes In The Movie Thief
Yes. In Boss.
Jessica Alba has a non-nude contract which means she will never appear fully nude on screen unless she decides to change the contract.
yes
No, she has not posed nude.
Yes
Like fairies, angels appear when you believe they will appear. This is a matter of faith and belief.