MH Customs made from Original Winx dolls?

[heftysmurf76]

When Monster High first came out, I noticed their similarities to the original line of Winx dolls (not the current line but the one from 5 or so years ago). Anywho, I've had some spare dolls in my bins for fodder for sometime now, and I finally got around to making one:
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I think that next to Ghoulia her little "cousin" fits in well, but when put next to Howleen, who would arguably be about the same age, her head is noticably smaller...
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So my question is what do you ghouls think?
Do the Winx dolls make for good custom cousins/little sisters, or are they too off in their scale?