In general my advice regarding "style" is not to stress about it, it'll form naturally over time and will probably change a lot as you're exposed to different influences. Like, when I was younger I absolutely refused to draw the outer edges of nostrils because I didn't like the way they looked, but now it feels weird NOT to include them.
That said, I really like the colors on the first one and it feels much dreamier than the others, but it looks harder to draw consistently. The second one seems more simplistic and is probably a good choice for a comic, where you'd be drawing the same character a LOT. The third one is nice and clean, and is clearly a little more anime influenced than the others (which isn't a bad thing), but the character doesn't seem as alive to me. You mentioned it's not finished though, so that might be part of the issue.
Anyway, again, don't worry too much about this stuff! I draw in different styles just because I feel like it all the time, just draw what makes you happy at any given moment 