Creativity, Practice, and Thinking.
-Get another person's pov at your house, and see what they say that needs to be improved/changed.
-Look at Blue Prints. Pictures of other peoples Minecraft House's, Real Houses, or anything imagery.
-Start small if you have to. Build your way up, keep thinking of ways you can improve on your house.
-Don't give up, that's essential. You'll just end up disappointing yourself even more.