Dear Mikael,
How nice to hear that the sun shines somewhere......but no problem....... the rain is a splendid excuse for me to stay home and paint. The sun has shone in my heart to day.
My best "looseness" shot is to consider the negative shapes as important as the positive.
Many painters seams to concentrate only on the positive....the thing....and pay no attention to the rest. That way the head, house, tree or what ever the motive is, will be isolated and be a closed form with nothing around it.
To make a painting loose you have to make the transitions between the forms as open as possible, so that your eye and mind can drift around and find equal pleasures in looking at the shadow of a cloud or the tower of the church.
In a painting every stroke has equal importance because they add to the whole.
As you see in my sunflowers( sorry, but they were at hand) I have painted the shapes from the outside as much as the flowers shapes itself, if you understand.
Another advice is to paint it all with the same two colors, try
Best of luck, Allan