This tutorial is for those who know some basics about Adobe Photoshop
Start off with your render such as the one below there should be clear areas for lightning potential.
Using the polygon lasso tool with no feather select the area for lighting be sure to include any little jagged bits to add interest as below.
Then fill this layer with a good deep color slightly darker than the intended lighting color as shown below.
Then duplicate that previous layer and set this new layer to color dodge the result should be a brighter color something close to what you want.
Select the original (orange) light layer and apply filter --> Blur --> Gaussian blur radius 6 The result should be similar to below
Finally on a new layer, with the above brush settings and a deep red color brush around the top and particularly the bottom below the light set this layer to soft light.
The result should be similar to that below.
Here is an example of it in use.
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Other helpful tutorials :
Trick to increase windows experience index
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Go through the following links to learn more about creating comics in Adobe Photoshop
Arrangement and collection of theme and pictures for comics.[Part I]
Creating speech bubbles in comics [Part II]
Give retro effect to the comic
Comic book fonts
Comic sound fx
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