Choose the Pen tool, setting the Fill to “none”, the Stroke to a 1-pixel soft, red.
Click, click-and-drag to trace your giraffe. Don’t forget to stop auto-curving by clicking on the last point, holding CTRL to move the point as you are drawing it. Close your shape.
Use the Subselect tool to adjust the curves and points, delete points. You can draw shapes and combine (union) for parts where you want perfect circles.
Fill body with color – hide the layer folder to work on the rest.
Spots – create a new layer folder. Lock the previous one with other stuff in it. Start by drawing ovals.