Great topic choice Posfan!
I look at postwork as a useful; but not entirely nessesary step in the creation of 3D images. I like to get as much done in the originating application (This helps me to learn it's strengths & weaknesses, and also gives me the opportunity to try 'render styles' that I otherwise would not) before I even consider using
photoshop, Painter, or any 2D image editor. Because of this thinking; my usual use of
photoshop is for repairing 'poke-through', or modifying color, contrast, or gamma levels.
Also due to this thinking, I do not save my
photoshop 'actions', and I rarely save custom brushes, or patterns. I have found that by not saving these 'timesavers', I am forced to look at each image as a new and separate artwork.
To create this image, I used:
1
Poser 5 render (almost 'final' quality), to check textures, and lighting before final rendering. I can use this render to help adjust the model's skintone. (see item 1 below.)
1 'final quality' render: in this case I notice a few things that I don't like; so I start planning for the postwork session.
1.] model's skin tone is too 'orange'.
2.] dynamic dress has poke-through on model's left hip.
3.] space between wall and floor. (Oops... I intended to fix that in
Poser...)
4.] camera's 'roll angle' (it seems like a camera angle from the 1960's
Batman TV series... heheh.
5.] scene appears 'flat'; depth of field is very low.
6.] poke-through on hair.
Once in
photoshop:
1.) Paste 'pre-final' image to new layer; changed blending mode to 'color'. This will help control the "orangeness" of the skintones.
2.) Selected and filled space between wall & floor. Added a new layer, then airbrushed 'shadows' into the seam between wall & floor, to help add depth to the scene.
3.) Used clone & smudge tools to remove poke-thru from clothing and hair. I then erased the corrected sections from the copied layer.
4.) Used the 'blur tool' to de-focus the wall, chair, and floor behind the model. I used different opacity settings, to simulate different distances from the camera.
5.) Make slight adjustment to hue & saturation of 'background' layer, and slight contrast increase to copied (color) layer.
6.) Created new layer, then used clone tool to add hair highlights from 'pre-final render'. (My previous color corrections, had caused the hair to appear too dark...)
7.) Add signature; skew transform it to match angle of floor/wall seam.
8.) Flatten layers; rotate image -3 degrees. I decided to not crop the rotated image, I'm not sure why; but I kind of like the look.
9.) Slight contrast increase of flattened image.
10.) Saved psd, and jpg versions of flattened image. (I used
photoshop's 'save for web' feature for the jpg files.)
{After viewing and considering this image for a few hours, I think that i could re-render the scene, and get a better 'final quality' image. If I do re-render this scene, I will probably attempt to get
Poser to add the Depth of Field too; I usually don't like to do this in
Poser, because of the large increase in render time; but some times, it is needed.}
[Tutorial] Before - After Postwork
Hey, all!! 
Tell us your secrets!! 
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(how hard is to explain this things with my english 
) and this is what I wanted to enhance, but as it's a very simple render, I decided to keep it simple, so what a I did is created 3 copy layers of the original in gimp ( I use gimp most of the times) and kept the original one just in case, the lower one of the 3 is untouched the mid one I apply a selective Gaussian blur, and clear the areas I want to keep sharp, the upper one I apply a very high Gaussian blur, then use the levels tool to enhance the lights then another gaussian blur, and set to screen, played with the opacities of the layers, combine the layers then final gamma correction, contrast and saturation, all this for creating what I call a subtle glamorous soft blur 
5 layers is too much for me 
... 
