At reference link Image No. 3, all drawing guides are completely done and now ready for application of oil paints.
Most of my work, I use 1 inch flat brush, especially working for sky backgrounds.
Landscape oil painting must be done in step-by-step (working from canvas top to bottom); first of all is to work for sky backgrounds, blending soft sky background colors using Pale Blue, White, and small amount of Cobalt Blue.
You may use the spirit of Turpentine as medium but I prefer to use Linseed Oil.
Blending sky backgrounds are very easy for me to do, just a uniform back-and-forth smooth but speedy strokes of flat brushes, do it horizontally, then using the other clean brush to blend it again vertically, and finally blend horizontally as a finishing touches, there it goes.
Just be sure to distribute all of the light atmospheric colors to the entire sky backgrounds, even for stormy weather or evening sky, it must be done with light colors.
Remember that the entire compositions of sky are all AIR, therefore the brush strokings must be blended smoothly.
Waiting for a couple of minutes, and if sense that the colors are partially dry, that’s the time to start working with the cloud formations.
It should be looked like what is shown on Image No. 3.
The same REFERENCE LINK from page 1 to 2: (right click the link and open in a new window)
Click the link to read next page (page 4)
Canvas Board Landscape Oil Painting (page 4)
Or click the link to go back to main 1st page (page 1)
Canvas Board Landscape Oil Painting (page 1)
Clouds are composed of WATER, like cotton buds, irregular, different shapes of cloud formations; therefore, your brush strokes should look the same way too.
Either flat or round brushes may do, and I prefer those brushes with long wooden handles, I feel more balance when I’m using it.
Reference link Image No. 4, I started to paint cloud formations using white for cloud highlights (try to apply a stronger line of whites in the whitish edge portion of the highlighted cloud, and cobalt blue for clouds shadow (try to blend those dark and white on some portion of the clouds)
Using the tip of round brush, point it with a very little amount of dark blue at the edges of cloud shadows for a more realistic view.