Those two sketches are taken from frames in the 1951 short, 'Lucky Number'.
This is Donald as seen on the poster for the 1943 short, 'Donald's Tire Trouble'.
Here's a frame of Fred Moore's animation right from the film. Though I drew it off of a rough drawing out of 'Illusion of Life'.
And how about another pose taken from 'Illusion of Life'?
I'll wrap this up with a pose right out of the 1938 short, 'Donald's Golf Game'.
The 'Illusion of Life' text: that's a good place to look for top-notch drawings to construct from.