It's really, really difficult to prove an image is original or doctored - 'photoshopped' has become a verb, in common parlance.

I bought a new pair of cargo trousers yesterday.
How much were they?
I changed two of the prices, but left two alone. Which is altered & which original? Exif data will be stripped by imgur at upload, but prior to that it would be identical to the original photo I took.
It's obviously a photo, because it's not all quite in focus properly. That actually doesn't affect the ease with which you can fairly seamlessly swap the numbers around. None of the image is 'manufactured', it's merely moved from one place to another.

The card data has been blanked & the image cropped, but that doesn't affect the task of swapping the info.
I don't regard this 5-minute attempt as 'perfect', btw. I can see where I cut it, but it would stand reasonable inspection, certainly at life size.

Whether you do this to forge or just for fun, you can either move, or simply re-create elements that don't exist in the original, in a kind of cut & paste way.

This just for fun… Harry Potter's bubble bath.
The G doesn't exist anywhere else on the label, so it's manufactured out of tiny bits of other letters. Again, it's not perfect, but it never needed to be.

The original image I uploaded here gives away its secrets under forensic analysis - Romeo's link to https://29a.ch/photo-forensics/#forensic-magnifier really showed up where I'd rough-cut & pasted.

So, armed with that knowledge, I made another that has much less of a giveaway

All I did was change the relationship between foreground & background sharpness & reduce saturation a little more, to prevent it showing under Histogram Equalisation so easily.