I see what you're saying. Despite being very-well drawn and designed, it just doesn't quite fit. There's a hint of "cuteness" to it that puts it a tad out of place in my mind.
There's this eerie, spooky battlefield and a cutsie undead rat-man—but it doesn't seem like you, the artist, intended for that to be the case, right or wrong.
An undead rat-man on a battlefield is a really cool concept, but I think at the very least, give him a rat skull/face. I think that change alone would fix the issue.
How about adding an undead crow on the sword's hilt or on the cross in the background? Too much?
Thanks for the WIP!