@shinwank ha ha but that doesn't seem to be the case. There are many on the end that have always been on the end, and many at the beginning that have always been at the beginning; in both cases, some are duplicates of each other, except for how big it is. So it seems like new content is being placed at random.
One of the best h-pixel artists out there, take a look at his pixiv that it's worth it, new stuff will always be in front (newest to oldest), and there will be tags to search for a particular series you may be interested in. I believe he did all of the DS castlevania's, did fire emblem, even did Momodora and DnD Mystara series.
@FarkyMac Hmm that seems to be true. This gallery only has 5 new images compared to its parent though, so does it really matter?
Edit: Ok only 12 compared to the parent of the parent of the parent, but still. Also, the order in the gallery isn't the same as the order sorted by file names, so I suggest comparing that too.