|Select the 'brush'-tool from the tool palette.|
|Change the 'opacity'-setting in the options (the top bar) to about 60%.|
|Click on the 'brush palette'-button in the options to bring up the brush settings.|
|Make sure you have selected 'brush shape' in the brush settings-list on the right side.
Choose a softened brush.
|In the lower right corner take the settings you're seeing on the screenshot. Leave all default settings and just change the following values.
'Diameter' - 120 px
'Offset' - 80%
Play around with these settings to achieve variations.
|Now check the the 'dual brush'- option in the brush settings and click on its name to bring up the settings.|
|Leave all default settings except the following values.
'Diameter' - 19 px
'Diffusion' - 310%
Modify these settings for a different 'cloud density'.
|Alright let's paint some clouds. Choose 'white' as color. In this example I've painted three times to get a good looking cloud. Click and drag the mouse to get the desired size.|
|If you want to have more density just click some times and don't drag the mouse.|
These clouds were painted in Photoshop CS3. In Photoshop CS1 the clouds will look very different because the settings will cause other results on the brush.
Play around a lot with the brush settings and the opacity to get different results.
I‘ve added a few cloud layers with different colors and overlays.