The trees plus mist is good. I suspect you would need tone mapping to bring out any more shape in the mist - if there is any more there. If your package has layers there is a video on youtube showing how tone mapping is done that way. It's for the GIMP but will still explain the principle. The variations are obtained by playing with the contrast etc of the layer that causes the changes. Trying to find one on Adobe products would be rather difficult but there is one that is more sensible relating to producing black and white images but it uses PS. Tone mapping can be subtle. In that respect I think the Rawtherapee shot I posted is borderline. The idea should be to try and get close to what the eye could see.
I like the rock - water - city - clouds shot but on sky colours I wonder if you have a white balance problem. The camera will generally get that nearly right in auto white balance but it wont be as good as our brain. I could see a slight cast in this one so if not as you want it's best to do a spot white balance on something which is pure grey / white in the shot that hasn't clipped. In this case the clouds but click in several different places and choose the "best". This really should be done during raw development - early on in other words.
People are inclined to forget that they can focus manually using the viewfinder especially on relatively close subjects such as the end of the rocks jutting out into your shot. It's important to set the dioptre adjustment on the viewfinder correctly. Easiest way is to AF on something the camera can't get wrong and then carefully adjust it while trying to keep your eyes relaxed and focused on infinity/the far distance. That aspect can be difficult. One way is to look into the distance and then the same view plus something closer through the viewfinder alternately but when you are out using the camera, looking around and not thinking about it you may find another tweak is needed. Mike's comment on live view is true but only if a magnified live view is used. Ideally sufficient to boost the pixel count on the camera screen to the detail level the sensor sees or close to that. So say it was a 1mp screen and a 24mp sensor - 24x. I have used my mirrorless EM-5 this way a number of times. Going on that 12x can be dubious given the numbers I have used. I/2 way between the two should be ok but might show slight fuzz at 100% resolution.
A good depth of field calculator to play around with is here
http://www.dofmaster.com/dofjs.html
You might notice it uses a circle of confusion figure, This is the out of focus limit for detail and assume that the image will be finally viewed at 10x8. It's usually going to be fine for shots that are going to be posted on the web. Just use it to get the general idea, a feel for it and to realise that there will always be more "in focus" behind the point the camera is focused to than in front of it. In quotes because a camera will only focus to one specific point. The circle of confusion sets how much out of focus the image can be.
Now you have curves under your belt perhaps it's time to look at levels. This maps the tones in the image into the colour space that is being used using 3 pointer, black, mid tones and extreme highlights. Black can be used to set a black point and the highlight one to set the white point. In this video the tonal range is being stretched, often the case. The other slider sets mid grey. The video is for the GIMP which doesn't matter as levels are levels. Auto levels can be useful too and if the results don't suit undo it.
http://www.youtube.com/watch?v=lNoBjAaC0kU
Layer style tone mapping is demonstrated here rather well. It's for the GIMP but Adobe products will have similar features.
Maybe some one can translate it to Adobease. Unlike Adobe product demo's of this it offers complete control. Most Adobe ones show instant gratification or slight changes to the basic setting for that.
This explain why many shots look as they do.
http://www.youtube.com/watch?v=FMlKVDjJFfY
John
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