Brutal thick black picture frame/outline
And that, my friend is the first clue, without even isolating pixels....
You would have used a border of about 6 instead of 17....
Too many people photoshop... that's great, but the ones who do it well and mean to fool you... will.
There are ways to embellish without anyone seeing it, but it requires extra time and work that most people don't know about.
Photoshop these days seems to be an ALL or NOTHING type of approach. They want to enhance hue and don't think that even a smidgen of an increase on an already great shot will be noticed, so they put all of the Saturation to max... and ruin what Photoshop was intended for.
Each to his own, I don't lay down the rules, but I HATE crappy Photoshop jobs, even if it's just supposed to be funny. Why not take the time to make it believable?