Hi Clarenze,
Appreciate your comments. Indeed I did alot of homework about Photography

After much pondering about the issues of sharpness, there are some queries in my mind. Probably you could assist me.
I'm using f8 and above for all my landscape pictures. (mainly f11), Auto-Focus (Nikon-Auto Area), Manual-Mode, Self-Timer trigger @ 2 sec and Tripod. Thus I would wanna find out the reasons for the lack of sharpness, is it due to the following:
1) I'm using Auto-Focus (Auto-Area) for the 3 different shot, thus the Focus-point might different in each different shot. Therefore, leads to softness
Do not use Auto-Area; its often we use AF, then switch to MF.
2) I using Manual-Mode instead of Aperture Priority for the 3 different shot, however, I'm sure that I did not change the aperture in my manual mode for the 3 shots. Will it still lead to softness?
How is "Exposure" achieved when S/A/ISO is fixed in M?
3) I'm using self-timer @ 2sec when trigger the shot, will it be better I using a remote trigger.
Usually fine as long as you add weight to your tripod & turn VR off
Last but not least, where do I focus if my pictures do not have a subject? (e.g #4 and #10) I read from the web, it said approx. 1/3 from the bottom to the mid point (below mid-point) For #2 and #9, am I rite to focus on the statue and Buddha's face? Sad to say, I got problem in finding points to focus?
Understand "DOF" & "Hyperfocal Distance"
Kindly seek your help! Your help might even assist me in the landscape photography apart from HDR. Thank!