As a nit-pick, fierce is actually considered to be one syllable long (I can see how it could be thought to be two but I always thought it as one and a bit of checking arounds seems to suggest it's one anyway...). Hence the middle line of the first one comes to six syllables, so it needs a touch of tweaking. (You could always slip in an 'and' after it though).
But I quite liked these - pretty good hiakus you have there imo! I like how the mood of each haiku suited the content.