skull theory accuracy 12 weeks?

Anyone used the skull theory at 12 weeks and been accurate? Top 3 pics are this pregnancy, bottom one is my previous pregnancy which I know the gender obviously. Interested to see thoughts on what gender you think they are based on the skull (or nub if it can be seen). Personally I see a very close resemblance of the shape of this pregnancy compared to the bottom photo on the skulls. First three photos aren't as clear as I have an anterior placenta, but still pretty good!