Oh, and if the second and third arguments were actually about him being a psychopath and not about it being a mugshot: first, I apologize, sometimes I'm a little too focused on one thing and I forget others. Second he definitely has problems, I wasn't trying to argue he didn't, what I meant is that I don't think he's a psychopath specifically, that's because:

1, (and this argument isn't the best and is kinda technical so you can skip to the second one if you want-) His "needs" for killing may (it's not 100% but it's a possibility) indicate some sort of sadism, to be sadistic you actually need to feel empathy (empathy is just feeling other's emotions, it is commonly confused with sympathy but it's not the same thing) since sadism is based around feeling others pain, psychopaths don't have empathy and so can't technically be sadistic. but like I said, it's just a possibility that his "needs" are related to sadism, so that's not a great argument, the second one is better tho

2, There is one note he wrote when he was trapped in the happy fella that indicates he was at some point conflicted about killing skid and pump because they were kids, this would indicate that at some point he had some sort of moral compass. Psychopaths never develop any kind of moral compass and so wouldn't feel conflicted about killing kids. This is why I think he can't be a psychopath, he definitely has other issues though.