Unless the subject is filling the whole frame at the time, I don't think it's possible to get the same level of fidelity from a screenshot. For example, this vector couldn't fit on an HDTV because of its pixel size, which means this level of detail couldn't be gotten from a screencap even if the subject filled the whole screen. I know it isn't original and would never try to take credit for it, but I just like seeing characters from the show in a higher quality, and I can't draw at all so this is my way of contributing.