opening and ending sequences:

Tuxedo Kamen's profile, from the first opening sequence ***
Tuxedo Kamen with yellow roses, from the first opening sequence
a beautiful profile shot (Mamoru's wearing a REALLY pretty domino in this pic), from the first opening sequence ***
Usagi running up to Our Hero, :P from the first opening sequence ***
Neo-King Endymion, from the second opening sequence ***

Episode 53:

do I know this guy? o_O
urr... some say this is Mamo at his best -_-

Episode 56:

Mamoru talks about why the previous cast members for his play disbanded (cute!) ^_^;;;
*LMFAO* I love the difference between the two reactions here ^.^

Episode 60:

Mamo-chan shares a kiss with Usagi... ***
...when he suddenly gets bonked on the noggin' ***
"what the hell has she been eating?" *heehee* ^_^ ***
a yamhead lands right on our poor Mamoru's mouth O_O ***
what a way to meet your daughter... -_- ***
"get it off get it off get it off!" ***
"I SAID get it OFF!" ^^;;; ***
"listen blondie, keep the ginzuishou and I'll just take this guy here" :) ***
I made this pic cause the hentai in me likes the way Mamoru's legs are positioned... ^_^ ***
Mamoru tries to reason with the yamhead... ***
...but it's to no avail (Mamoru has the -_- face here) ***
Mamoru looking miffed (and hot ^^) at the yamhead's words ***
the yamhead shoots Usagi, to Mamoru's shock ***
so he runs over... ***
...intending to push the yamhead away ***
another pic made by the hentai in me - I like the view of his pants ^_^ ***
let's see that AGAIN! heeheehee... ^^;;; ***
Mamoru looks down and is shocked by what the yamhead uses for bullets... ***
suction cup darts that have flowers on them? ***
naturally, Our Cutie gets pissed at the yamhead ***
"okay, which one of you idiot scriptwriters came up with this one?" ***
he looks so kyute when he's angry ^^ ***
so anyway, Mamo-chan turns around to find the yamhead... ***
...but she is nowhere to be seen ***

Episode 66:

the Neo-King, from Chibi-Usa's memory ***

Episode 68:

a timely interruption ***
Tuxedo Kamen on some construction thing O_o ***
nice legs... o_o ***
Tuxedo Kamen lands gracefully ^.^ ***
a close-up of Cape Boy's face ***
another pic of his face :P ***
Tuxedo Kamen shielding Sailor Moon and Chibi-Usa after attacking Rubeus ***

Episode 69:

Mamoru listening to Luna talk to him about Usagi ***
Tuxedo Kamen... yippee :P

Episode 73:

Mamoru and Chibi-Usa the morning after (just kidding :P)
Our Cutie uses a Tuxedo Kamen dollie to cheer up Chibi-Usa
oh my... Mamoru and his "hand puppet" -_-;;; ***
another small shot of the UFO doll ***
Mamoru thinks about what to feed Chibi-Usa (arsenic! arsenic! ^.^;;;)
"urr, she went thataway..." (he's so kyute in an apron ^^)

Episode 74:

Mamoru contemplates throwing Chibi-Usa over the rail *teehee*
Ben Dover *hehe* ^.^
a mad Mamoru, with Luna

Episode 76:

Mamoru holding Chibi-Usa
with the Inner Senshi behind him

Episode 77:

a pleasant dream... about Mamoru marrying Usagi! that means it's a nightmare! >:P
heeheehee... eh... urr... ahem -___-
is it just me, or does his face look a bit chubby in this pic?
I *told* you it was a nightmare (I love his face here)
Usagi holds a pic of her with Mamoru... yay :p
I love his face in this one - such a pensive boy ^^
hey, you'd look sad too if bad animators controlled how you looked...
close-up of Mamoru in the doorway
Usagi says she knows why he's avoiding her...
close-up of Mamoru, with roses in the back
a sad Mamoru leaning against the wall, after Usagi has left
a rose flashes by as the Inner Senshi are fighting a "youma?!"
Tuxedo Kamen to the rescue! (or something like that ^^)
Tuxedo Kamen talking to Sailor Moon
smaller, similar version of above pic ***
close-up of Tuxedo Kamen's eyes ***
he says they must work together even if Mamoru-and-Usagi are no longer
Tuxedo Kamen go boingy boingy boingy! :D ***
a lame picture of Mamoru starting to turn around ***
wow, he actually looks boyishly Asian in this picture! :p ***
Mamoru turning around to see Usagi running to him
a happy Mamoru, with disjointed eyes ^^;;;
smaller, similar version of above pic ***
Mamoru, profile view ***
profile view - revisited ***

Episode 83:

a ghostly projection of the Neo-King's spirit ***
Neo-King Endymion ^^;;;
Tuxedo Boy learns that Chibi-Usa is HIS daughter by USAGI... poor guy! ***
and then Mars demands to know exactly what day this all happened... -_-;;; ***
Chibi-Usa and Neo-King Endymion... enjoying a father-daughter moment -___-

Episode 85:

King Endymion with an umbrella... how mundane... yet cute nonetheless ^.^

Episode 88:

Tuxedo Kamen combines powers with Sailor Moon
Black Lady remembers happy times (as Chibi-Usa) with Mamoru
a gorgeous Tuxedo Kamen
Chibi-Usa is inside Tuxedo Kamen's cape o_o ***
Tuxedo Kamen does a half-smile type thing... I dunno -_- ***
Tuxedo Kamen with messed up hair ***
Tuxedo Kamen with messed up hair and an open mouth o.o;;; ***

screenshots from episodes I could not identify:

the Neo-King looking over his shoulder
a gorgeous-eyed Tsukikage no Knight doing that two-finger thing
Tsukikage no Knight brandishes his trademark white rose
the Knight, making an entrance on a streetlight -_-

cels/cards/general pics from or based on the Romance season: