The one good upskirt look comes from "Tears of the Prophets", and features some detailing in there, surrounded with blue glow. (Also note the CGI Mirandas
with additional impulse engines in the pod!)
Here's another look with detailing, even though the model itself is relatively crude overall. (This time note the yellow glow on saucer impulse engines on that Galaxy
; also, two standards of Miranda
Finally, there's the detailed death scene of the Valley Forge
. Despite the lights being out (for obvious reasons!) there appears to be some sort of detail in there nevertheless. Also note the aft torpedo tubes, protruding more clearly than in the physical model(s).