It's best to ask permission if you're going to draw someone. Some peopel would be flattered, but alot take offence. If your sister doesn't mind posing, then that's a good option. Otherwise, you can always find photos on the net to draw There's plenty of royalty free images of people, and celebrities are fun to draw too (but they hold legalities on how much you can copy of them >.> )
Yeah I haven't spoken to my sister about it yet, so I haven't started anything as of yet. I just don't want to bother her with this for a little while, she's have a seriously hard time at school with a former friend of hers, and I don't want to upset her more than she is. So as of right now I won't be drawing anyone. I don't feel comfortable drawing someone I don't know, and yeah like you said, some people get offended if you don't ask. I'll get one done, but as of right now I don't think I'll be drawing anyone. I might if I can get permission from a friend, but that's unlikely.
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