"Why was this pic deleted?"

I took this straight from the post via Snapinsta, I can't make it any higher quality than the original ^^'

Sometimes the source image is of low quality.

Looking at the photo, it looks like it was taken a digital zoom, resulting in a low quality image.

that's a shame, cause those quads are absolutely popping

It seems it was reported but without a reason. Or is the reason just hidden for me?

It was probably reported and deleted for being a morph. Her bicep looks very suspicious.

It seems it was reported but without a reason. Or is the reason just hidden for me?

Yeah, looking closer the arm on that pic definitely looks morphed to me.

You've also tried to upload this, which indicates you aren't looking too closely and have a poor choice in sources for some of your images.