Alter_ego sir, in general, in order to HDR the images must be exactly overlapped. Thus besides images of the same size/res, you need a tripod when taking the shots. Hand holding the camera is insufficient- the images will not be identical enough to overlap. Just as an example a recent HDR I did merged three exposures taken at 2.5", 4", and 6" - a total of 12.5 seconds of exactly the same street scene- and it overlapped perfectly. Of course not difficult in the least with a tripod- but pretty neat to think that nothing moved for 12.5 long seconds to make the shot! Anyway just explaining so next time you'll be set. Also watch the horizon line- it's distractingly tilted. Keep shooting!