Yeah, try to do some in-game screenshots at the highest graphics settings you can.
It's hard to explain it, but looking at other popular MP5 skins (especially by xtab), their textures look less pixelated. It might just be the screenshots you have here.

Thanks for the feedback. I should probably upload some in-game screenshots. In regards to the resolution, generally all Rust skins are kinda pixelated - it's unfortunately just how Rust is really and I believe there's nothing that the dev can do about it, however I could make a few edits here and there if there's too many noticeable kinks (perhaps the logo on the sight). Here's a few examples of accepted MP5 skins that also share the same issue (note that my graphics are on 5): https://imgur.com/a/mu4CXqZ

This looks very low resolution. Might just be the screenshots though.