Difficult to explain... I suppose its that they are very detailed in the shading so it makes it difficult for amateurs like me to re-color them to fit other stuff. Doing it the other way around (applying your shading and color palette to other stuff) is even more difficult :P I have no idea if this is an issue for others though, I suppose I just want consistency throughout my game but I am not at your level :P
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Just a suggestion but making monsters like that might be an option too, although monster capture games are fairly niche (Even though its what I personally prefer) sideview enemies with animations would most likely be the best bet as they can be used in classical FF like games and sideview scroller type games like Mario/Castlevania etc.