Neither of those photos were that large. The largest photo of DT is from cjonline. Then >file >Image Size - followed by - >filter > Noise >Reduce Noise. Full strength & set the "preserve detail"and "Sharpen Details" to the lowest & check the box that says "Remove .jpg artifacts.
The other DT image popped up on some husker blog. The only element I needed to be sharp was the "GOAT" under his eyes... which is just some random font I found. The original photo had his area code or some other # under his eye.