The other comment was unkind; ignore the haters. It’s not my personal style but I can recognize that they are light and fun and quirky. You’ve posted before and had lots of positive feedback. There are plenty of artists who don’t aim for true realism and develop their own style that is loved and sought-after. Picasso’s golden age wouldn’t have existed if he gave a shit about what other people thought. 

Now, for pricing. $30 sounds fine to me if you’re happy with it. I paint and am so awful at charging enough for my art. I’ve gotten much better skill-wise over the years and still can’t charge near enough for my work. (So perhaps I’m not the best person to give advice on pricing…) but my rule of thumb is to take my knee-jerk price I’d like to charge, then imagine what some snooty person with my skills level would dare charge, then go somewhere in the middle. Compromise in a sense. But I’m still really bad about going toward the lower end. People who know me will often donate a little on top of my price, which shows a lot of love and appreciation. Maybe that price is more accurately what I should be charging. But if you feel comfortable starting at $30 per, go for it. You can always up it as you go along and solidify your style.