Can you add pictures to Wikipedia if they aren't yours?

I was just wondering if it is possible to add pictures to Wikipedia articles if they aren't yours, for example if they are from google images? I know that there are a lot of laws about copyright nowadays and so i don't want to get in trouble over that! I've looked on copyright free image websites but... show more I was just wondering if it is possible to add pictures to Wikipedia articles if they aren't yours, for example if they are from google images? I know that there are a lot of laws about copyright nowadays and so i don't want to get in trouble over that! I've looked on copyright free image websites but they just don't have the same quality or range of images for what I wanted, thanks for any help :D
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