Hmm the first one looks like the eyes are wrong and the hair is spiked up to much and I am getting the impression that it may have been digitally drawn possible even photoshoped. The second one has the right eyes, I think the hair is spiked a little to much there too as for the top I am not sure if a female SSJ4 form would look different from the male. The third one has way to much spiked hair, almost as if it doesn't belong on his head, I think the eyes are wrong and it doesn't seem to have as much detail as the others. Finally the forth one like all the others I think the spiked hair is a little much, again the top I am not sure what to think like in 2, also I am not sure if Bulla would have that defined stomach muscle.
I'd have to say I like the last one best.