^ You're right. That could be the sonic shower. It's close to what we've seen in "Drone" when B'Elanna took a sonic shower.
Therefore, I have a good hunch that Janeway's bathtub is around the corner from the right side of the sink. It's dark and one can't see what is around the corner, but I guess that's where the tub is from "Q2".
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I changed my mind. That can't be the sonic shower, given I remembered now that B'Elanna's sonic shower extende from ceiling to floor, so the shower can sonic clean the entire body. Those blue bulbs behind Janeway, in my "LFaP" cap, doesn't extend down to the floor.
Besides, as anyone knows, TPTB have a tendency to make new designs that doesn't fit with previous ones.
This pic from "Q2" shows Janeway's tub and surrounding walls. The walls doesn't match with what was shown in "LFaP". IMO, I think Janeway's bathroom suppose to look a lot bigger than what we've seen in "LFaP", given the entrance to the bathroom is at the rear of Janeway's bedroom and not in front near the windows.
Therefore, I now conclude that shot in "LFaP" doesn't really reflect Janeway's true bathroom size, given the *huge* size of Janeway's tub seen in "Q2" and the location of the entrance from the bedroom. Given she's the captain, she suppose to have a bigger bathroom than either Kim and Torres, whom we have seen the sizes of their bathrooms. Judging from the pic from "LFaP" alone, it seems they made Janeway's bathroom the same size as Kim and Torres's, and that doesn't seem right.