not bad for a first attempt - i think 1&2 would have benefitted from not cropping the top of the flame, while 3 would have benefitted from not cropping of the right hand side, they are also a bit soft - i'd put that down to movement blur and would suggest a faster speed (and a correspondingly wider apperture)
I guess it all depends on what you were trying to achieve with the image, as abstracts I quite like them
Matt
MWHCVT