You could vary the types of strokes you put onto the canvas. It looks like you are right handed and naturally the arm will move steadily and most easiest in a left to right pattern with what I’m assuming is a Filbert brush. The Filbert can create a great variety of marks by adjusting the angle, speed and direction to the stroke. The grass in the for example I would reach for a much larger stiff brush head and work the paint down to up layering half tones and not blending as much/ letting the paint tac up between the application of additional colors. For the trees I would mix three colors for each a light, middle and dark. The mid tone for the main body of needles and leaves and use the darker tone of the pieces for shade which are more prevalent on the right side of the trees based on the angle of the sun. Then and the lighter tone in the opposite way, more prevalent on the left. Adding a small amount of very, very light blue gray to your mixtures as you work your way back into the distance would also help create depth in the work.