Well, "analog" photography we use for the "traditional" type of photographing, that means with a film, either slide or negative. Analog in this context means "non digital", but actually I think it's not a correct expression.
"Creative" photography I would describe as the artistic way in photography. No difference here whether you use digital or -hmmm- "analog" cameras, it's your creativity which counts here, not the technique you are using.
"Digiart" we can describe as creating pictures with digital imaging, that means mainly on your pc. Also there is a wide range from "normal" pictures which are treated with some filters, falsifying of pictures and completely digital created pictures.
Many of those expressions can, as far as I see it, be interpreted different, other colleagues might give you other explanations...
In fact, it's very interesting to see which other definitions we might hear...