Hello I have to say I am loving your game, the idea of playing the "monster" is a very refreshing change of pace. Definitely looking forward to more from you. The story itself is also very interesting, hope we get to save the princess soon. Really like the description and detail you give to the scenes.
I do have a slight piece of advice, if you are going to get custom art for your game make sure they are done by the same guy. Nothing is more disorienting than having vastly different CG scenes. I might be bias but from what I saw in the game unless you already have another artist already planned or are going to do it yourself I feel like Lucien or Aka6 would be the best choices considering the theme of your game. (Although I know it can be expensive and they might not be available).
For the capturing of maidens in chapter 3 i do have an idea if you are interested. How about you come across a more mature noble or high ranking lady. She had little luck in marriage and still unmarried and is considered "too old" by most nobles making her chances of marriage abysmal. You can try to take her by force or try to charm her into coming willingly with you (after all a dragon can be quite the catch).