I noticed when looking through the monsters and sprites that several of them seem to be missing a few lines of pixels at the bottom (most notably the black outline). See the zoomed capture of the Orc_5.png from this pack as an example.
I can compile a full list if needed, but it does show up in most of the battler packs and several of the sprites too (though the sprites are harder to tell given the compact size).
This is otherwise great work you're doing, I'm looking forward to seeing more!