They're not bad, but they're not good either.
Farewell, My Mask? I feel like it could've been Farewell to My Mask. They definitely could've fit that in- Also the phone and water are upside down, and it's really making me confused... Farewell does mean the same thing as Goodbye afaik, but I feel like Goodbye has more... OOMPH to it? Like, Mafuyu is finally letting go of her "fake self" or something like that, saying farewell is sentimental and nice imo, while saying "Goodbye" can also be the same, but it also be in a... "I'm glad I'll never see you again" way? I'm sure the latter is the tone of the fan translations, and the event seems pretty intense.
Our Constellian of Song... It's interesting. I like how it's similar to the way it looked in JP (unlike Miss Masked Self here...) But my brain can't wrap around it for some reason. "Tied by Our Constellation Song", "Our Constellation Song"... I don't have any strong opinions, but my brain isn't accepting "Our Constellation of Song" for some reason. Not bad if I say so myself, it's just that my brain gets confused.
Bustling Cafe REC is understandable imo, I just liked the sound of Hectic/Slapstick Cafe REC as well- Although Bustling would sound more... accurate? They are doing some sort of skit, something like that. And it's MMJ... And energetic girls. I don't even know what to say here to be honest, it's not bad, but the bustling part took me off guard, but I can get used to it.
Bustling Cafe makes the most sense, Constellation makes sense somewhat, and Masked Self could be better; They didn't need to use all that room for "Farwell", it looks a bit strange imo.
This is probably the longest answer I've ever given haha