Many people have suggested I do a tutorial on clouds so here goes!
First you want to create a background color I do this as a solid color then airbrush a slightly light color over top Airbrush tool brush size 100 Opacity 30 and Color 100
Next I use the smudge tool round soft brush size 40
blend 30 and with a stippling motion create smudgy streaks where you want the clouds to be this will be just a guideline as you add in details later
Next I like to use the lightening and darkening tools alternating.
brush is round soft size 90-100
opacity on 5
everything else at 0
Use the same stippling effect that is like dotting in short stokes cross the page creating darker spot then click on lightening tool using the same setting to go over the cloud areas. This will create a wispiness to the cloud base. Keeping in mind a light source that we are about to create in the next steps.
next you want to choose a contrasting color for light.. I am choosing an orange yellow airbrush a brighter spot that will be your light source and then lightly I mean keep opacity LOW ALWAYS when doing the sky and clouds opacity 9 color 7 highlight edges of clouds
I then switch from airbrush to pencil still opacity 9 color7 go to an almost white and trace the outlines of what clouds I want to see. move the mouse quickly and hold down your left click button in a flowing motion around the clouds edges
a Couple of steps happened next using the darkening tool i shrunk the brush size down to about 50 and went back over the clouds again. opacity about 2 to just create more of the wispiness alternated between darkening the bottom and the blue areas. used pencil on white opacity 9 color 7 to outline clouds and define shape then put in the small trailing white line clouds that add the interesting details.
That is all to taste alternating dark to light on VERY low opacity NO color shaping clouds edges.
Then use the smudge tool carefully. to the left and right of your light source you want to grab the darker color with a mouse click on it and hold down the left button and not let go and pull that dark color round soft pencil size 3 opacity 3 into the lighter colors do the same thing around the clouds with the darker into the lighter colors to define edges.
This steps shows ultimately why it is important to keep those white pencil strokes so low in opacity. Use the lightening tool round soft size 90 from that center light source in sweeping out motions to meet the clouds and those white highlights will show up as bright cloud linings. Alternate again using the darkening tool sweeping in from the outsides between the clouds.
One last trick i use is to click on the lightening tool settings to be round soft thickenss at 1 opacity 15 clor 25 using the color white and put it on straight line stroke. sweep across the screen about 1/3 of the way down where that light source is. When you look at a horizon you often get that stingy line effect just go back and forth parallel lines across that light source. it will look like the light is pulled across the page.
finished product should have dark spots, light spots where the light dances in the clouds, shadow and a wispy feeling where you can see thru the clouds.... Hope this helps someone and isn't too confusing. I would be happy to do a draw chat sometimes it is easier to watch there. thanks! :D