What's the giveaway in your opinion?

The unedited post had a visible google gemini watermark which was very obvious. Shoe gravity is incorrect to.

Here is the one from the original post. Its her exact blossum link I did not reupload.

Does this mean fully generated or improved too? I don't use these and I don't know how this fully works.

It can be either. I find the picture very coherent except for the shoe. So I expect that it was a real picture but not the same person as the account. So they had to get creative and asked AI to add the shoe.