Tuxedo Kamen looks like Nightwing for some reason. This looks like if DC drew Sailor Moon characters.
And yes, Jupiter should be way taller than the rest. I was under the impression she was at least 5'5" or so (which would be very tall for a 14 year old Japanese girl).
This image is actually 20 years after the events of the sailor moon series. Sailor Jupiter is actually 1Km behind sailor Venus, that's the reason she looks smaller than the rest.