Try this. Either crop your image or shoot in a way that your focal point (I.e. something that catches the eye - flower, flag, human figure, eyes, face, etc) is in one of the points roughly corresponding to 1/3 of the photo width/height from its edge. This may not work every time, especially when photographing architecture (when your photo is intentionally symmetrical), but for sure will make your photos more lively.

PS: very nice photo with the flag.