You can express it in this way, but you would need to add 'to the camera', so your sentence would read as follows:" I am standing in this picture with my back to the camera".

The only change I would make to your sentences is 'their fault', not 'their faults'. Someone who is smarter than me can explain why we use the singular form of 'fault' here. The tense in your sentences sounds good to me.

I would say 'until this rumor dies down'.

Brand new is an expression (sometimes these words are hyphenated) that emphasises the 'newness' of the object. It means a completely new start.

Hi Victor In this context we would say 'a sports car' not 'a sport car'. And your second suggestion is correct "A sports car overtook us." Using the word 'zipped' is a way of telling us the sports car was going fast.

Or do you mean 'centre of attention?' What was the context of what you heard?

I would use your third option 'I wonder what's on this USB flash drive'.

Yes, you can say 'go and wait at the car' or you can say ' go and wait near the car.'