Artists who work solely from photographs really do miss out on those marvellous energizing sensations of being tossed around in the wind, or being spattered in face and sketchbook by rain, snow, hail, or whatever. These sensations link you with the natural world, and provide a tremendous advantage when you wish to really make your paintings more dynamic and full of movement. But, of course, not everyone wishes to go through such experiences.
For the branches I mixed some burnt umber and French ultramarine and applied it with a number 1 rigger. To give a sense of strong wind and movement I painted with vigorous strokes outwards from the centre of the bush. When this was done I spattered a number of small blobs or spots with the same mixture, to further enhance the feeling of robust movement in the branches. With all the branches bent in the same direction it suggests a rather windy day.
Watch for these effects when you are out and about, and note them, even if you don't have a sketchbook or camera with you. You can, of course, include them in a composition where there is no wind, just to liven things up a but, or to create a sense of movement. This can be really effective on water - I've just returned from a few days in London and when sketching on the Thames the water was alive in the wind, creating a real sense of sparkling movement in the sunshine.
have a go at this more vigorous approach - it really does give your work a marvellous boost.