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Even though there are several approaches to adding sunlight, I found that the most flexible result can be achieved in the Curves > Levels panel. You can also try the Exposure Correction tools in addition to this.

The idea is to stretch the histogram, in order to get more contrast in the high tones. For this you should move the Hight Tone slider from 255 to about 240, and then press Apply.

Next, you might want to remove the blue stain resulting from a faulty white balance in the camera, which often happens in snowy environments.

Using the Automatic White Balance of CodedColor turns out to be too radical, so open the Color > Color Cast panel and use the Pipette to select a stained snow area, which will then be "cleaned" to a shade of white and gray.

This feature is very innovative, as it automatically detects the underexposed areas in the image and brightens them up, leaving everything else untouched.

In the Exposure > Smart Flash panel, move the Slider to about half the scale, and press Apply. You will notice, that the person in the image lights up as if you had used a flash on location.

Now comes the fun part where you can be somewhat more creative, much like an artist touching up a painting.

Open the Clone Brush tool, select a brush radius of about 30 and a feather of about 75, then press the SHIFT button and click on a snowy part of the image next to the ski. Then just paint over the ski, replacing it with snow.

You can select several different source points, in order to make the result more realistic. If you are unsatisfied, press the Undo button and try again. You will need some practice with this, as the coming clone task is a little more difficult.

The ski lift runs through the whole image, and you will need a steady hand in order to remove it without a trace.

To start of, undo the zoom with the No Zoom button, and pan to the left part of the image. Again, open the Clone Brush, but this time select a much smaller brush radius of about 10 and an even smaller feather. Now SHIFT+Click in the snow above the cable, then slowly paint over the cable from left to right.

If you need more practice, then start with the fence at the bottom of the image, which you might also want to remove.

Once you get to the lift station behind the person, you may also need the Eraser brush and the Retouch Blur tool, in order to correct some mistakes and soften the borders.

Note, that the Eraser brush undoes all changes to the image, including the exposure corrections at the beginning of the tutorial. So you might want to save the image under a different name prior to any cloning, in order to clear the undo memory.

Once you're done with the removeal of unwanted objects, you might touch up some of the cloned areas showing obvious texture redundance, again using the clone and retouch brushes.

Finally, we come to the most dramatic improvement to the original image, where we will replace the rainclouds with a sunny sky.

For this, we need to find another image close to the same size, with the sky we would have liked to have on that overcast skiing day. Load this image in the Fill Tool texture panel.

We then move the tolerance slider to about 15, click on the fill bucket and then in the sky above the mountain. We will immediately see the gray sky area filled with our source image.

Since the sky will probably spill over the mountain, there are 3 measures we can take:

For best results, you can combine any of these measures.

An alternative to the Fill Tool is the Paint Tool, where you can also paint with a texture from an external source image. This may take a little more time, but the result can be more exact.