Hello @baderkh
You can post any of the photos from the net but u need to mention the source in your post regardless the owner of the photo accept to do so. Better to use your own photos in ur post, also you can use the free photo website like pixbay for your post.
Steemit Privacy Policy and Terms of service here for more detailed clarifications.I didn't get your second point @baderkh. If you are taking about the verification while opening of any account, then no need to upload your photo for that. You can check out