The Pen tool gives us lots of freedom to turn a photo into vector art
Imagine the image in blocks of colour. Select the Pen tool and click to create your first point.
Draw around the first block using Cmd/Ctrl and drag to move points created. Opt/Alt and drag to adjust the curve.
When you’ve drawn your first shape, make a new layer with Cmd/Ctrl+Shift+N, Ctrl/right-click>Fill Path. Select Color and use the Eyedropper to pick a colour from the photo.
To keep everything flexible, create a new layer per shape. This also allows layer order to be adjusted.
For details, use the Pen tool again to outline, and this time select Stroke Path. Select your tool as Brush; making sure your Brush is set to 100% Hardness and the size and colour you want. By checking Simulate Pressure you can add some extra depth to your detail.