hahahha thanks for that burn tip SrBiscuit!!!! I just got CS4 so that was a great tip:
here's a first crack at it that took a few minutes to do. will definitely have to spend some more time on it later. If anyone would like to have a go at editing it, please do!
Now it just looks really fake. I think the bottom line is that those clouds just aren't that impressive looking. It would take alot of work to make them look both menacing and realistic.
Im a noob but I recommend maybe converting to black and white and play with the contrast. It think it would look nice imho. Like the composition of the photo.
when using the burn tool, turn the opacity of the brush down ill try an edit a little later (have to reinstal photoshop... i moved from windows to linux ubuntu! what a hassle getting windows apps to work!