With the GPU temperatures reaching that high, a single exhaust fan and no intake fans at all, it's no surprise the computer's pumping out heat.
As Zerk2012 said, you could replace the GPU for something far more efficient, like a GTX 1050. You're unlikely to notice a performance deficit either as Photoshop tends to hit the CPU harder than the GPU. Besides that, and if your case supports it, I'd highly recommend that you buy at least one intake fan for the front of the case. Ideally, you'd have two at the front to bring air in and one at the rear and one at the top to exhaust air out.