This keeps happening to me: I suddenly come up with an idea for a drawing. I would like to think it's inspiration that allows me to have a clear picture in my mind instantly. However, I always struggle with the idea that it's too clear and I must have seen it somewhere before. Often I will scour the internet using google image search and of course, key terms from my idea. I almost never come up with anything close at all.

I guess my questions are:
Does this happen to you?
How much work do you put into making sure you're not ripping off someone else's work?
If you put any work into it - how are you able to come to terms with it if you find nothing?

That's it. I just struggle with this a lot.

Thanks.