These are great. Very well done. Two issues/suggestions. The checked radio button in Flat: the outer circle should either be thinner or the button should just be a circle with a hole in the middle. The checkbox in Polaris: don't have the check extend outside the box as it doesn't look consistent with the rest of the style.
Those are my suggestions. Do with them what you may.
Those are my suggestions. Do with them what you may.