[fullmetal]

So the first thing that stood out to me was the lack of depth/perpective for the text and graphic on the shirt itself.  Specifically, the white-to-orange gradient on the right horn tip doesn't follow the curve of the shirt at all.  Ditto for the text, which looks really straight for being screenprinted on a t-shirt and worn by someone with a rather non-planar body.  The graphic on the hat look similarly stiff and without depth for something that should be following the curve of a human skull.  You can also see the single-tone blotching on the shirt behind the text and above it where some erasing has been done.

It's possible that the original shirt color was burnt orange, but you can apply filters to change that too (definitely more complex than what's obviously been altered with the image).  But this photo has been altered significantly.

[fullmetal]

So the first thing that stood out to me was the lack of depth/perpective for the text and graphic on the shirt itself.  Specifically, the white-to-orange gradient on the right horn tip doesn't follow the curve of the shirt at all.  Ditto for the text, which looks really straight for being screenprinted on a t-shirt and worn by someone with a rather non-planar body.  The graphic on the hat look similarly stiff and without depth for something that should be following the curve of a human skull.  You can also see the single-tone blotching on the shirt behind the text and above it where some erasing has been done.

It's possible that the original shirt color was burnt orange, but you can apply filters to change that too (definitely more complex than what's obviously been altered with the image).  But this photo has been altered significantly.