Planetary Blog has a nice review of Voyager 2’s flyby of Neptune’s moon Triton. That was 1989 and sadly, there is no way we will be seeing any new Triton images for at least 20 years as no missions are currently approved. There is a concept mission being considered for a New Frontiers class probe which is where we even get the number 20 from, but if that mission is not approved… who knows.
Ted Stryk has been re-working the old Voyager mission images at Triton and the results are shockingly sharp and high resolution. Ted’s work is also used on this “portrait” image of Triton, but this image shown above is another view and is comparatively massive in size for the Voyager Uranus/Neptune encounters.