hmm yes the sister seems right yet wrong?
things that pop out at me:
neck size
thighs/legs a tad too big? legs could be closer together?
the lower half seems to be of a larger person yet the upper half seems to be of someone with a petie build?
top of head hight (the eyes shold be 1/2 of the way dowen the head but here they seem to be 3/4 up the head? or is it just me.)
but still fantastic sculpting! the face is really awsome!
1000/10
-fuzz
p.s. how about a red terror ersion of the trygon... gribbly om nom nom