The Shrine Maiden with the dignified expression is very enticing. I like cute expressions too, but I would enjoy seeing more in this style when it is appropriate.
Also, please consider sometimes using a pose that shows the entire girl (torso and rear) in profile, with viewer facing part way to the back, with girl looking over her shoulder at viewer. This sort of "glamour" pose shows off the girl's back side and can be very attractive with the right subject.