You may get .psd* file of "Mysterious Lightning" Photoshop tutorial by making a donation. Put the tutorial title in "Add special instructions to seller" line of PayPal and it will be sent to you shortly.
The picture before and after editing (Click to enlarge the picture):
- Open up sky image in Photoshop.
- Right click on Background layer, choose Layer From Background.
- Go to Image > Canvas Size.
- Increasing the canvas size adds space below an existing image.
- Transform sky.
- Edit > Transform > Perspective.
- Choose Filter > Distort > Spherize .
- Select sky layer in the Layers palette.
- Drag the layer or group to the New Layer button .
- Go to Edit > Transform > Flip Vertical.