Assuming you want a step-by-step guide:
1. Begin by sketching your bird onto the canvas with a light pencil mark. This doesn't have to be perfect, but try to get the basic shape and proportions right.
2. Once you're happy with the sketch, start painting in the basic colors. Use a small brush to add in the details like the beak and eyes.
3. Once the basic colors are down, start working on the shadows and highlights. Add a little bit of white or light blue to the areas that should be light, and a darker color to the areas that should be in shadow.
4. To finish up, add in any final details like grass or trees in the background. Use a small brush and light colors to create a sense of depth.