
Pluto is, in astronomical terms, right on top of us. It is only 0.000628 light years to Pluto.
This is Barnard’s Galaxy. It is one of the nearest galaxies to us, being about 1.6 million light years away.

Moving the camera to Pluto while taking a photo of a Barnard’s Galaxy would have about the same effect as moving your iPhone by the width of an atom while taking a selfie.
Here is a picture taken by the Hubble Space telescope. Some of these galaxies — the redest coloured ones — are more than 13 billion light years away.

I’m not sure you’d get noticeably better pictures because in astronomical terms you’ve barely moved. It’s like trying to get a better picture of the moon by climbing up a ten foot step ladder.
Not only that but the outer planets are still orbiting the sun, so if you want to image something in one direction but your orbiting telescope is circling a planet on the other side of the solar system you’re actually further away. Just as well you’ve hardly moved really.
I suppose you might benefit is some ways because it’d be so far from the sun, but that might come with other problems. Bandwidth for sending the images back to Earth might be one, power almost certainly would be when you’re out where solar panels would produce so little energy.
I imagine we could put a telescope out there if we really wanted to but we can almost certainly get a bigger bang for the buck by making bigger telescopes and not bothering to send them so far away.