I guess in January there would be relatively less people than there would be in April, at least in my experience. The sunset looks perfect at every angle. From Station 1, there would be much less people. Further down the more touristy place, there would be more sails. So it depends on your mood. Everyday, try to be at different places when the sun sets because you will never know what you will get.
And I don't care if you have a fancy camera or a tiny phone camera -- just shoot. There is nothing worse than regretting not taking a photo just because you didn't feel like doing it. After the sun is out, continue strolling to the north or to the south. To the north if you like less people. To the south if you want to have good food.
Boracay at Night
So the night stroll does not matter at which time of year because everything pretty much looks the same after dark. Except of course during habagat when the winds seem to want to bring down anything standing on the beach which explains all those windbreakers.
There are "illegally" built sand art with which you can take a photo of you and the gang for a fee. Local children built them during their free time to earn extra money and of course to have fun too.
Everywhere you go, the lights are colorful and pretty and everyone is looking for a relaxing spot to cool down after a long day at the beach. You can get goofy too. You can also watch the fire dancers for free because they are almost everywhere on the island.