Take a photo of a crinkly motorbike cover, shade areas to make a face appear. Use the spray brush tool and a colour picker tool in a drawing app to match in shapes and colours. Add shapes using various pens like chalk or wax crayon options if you have them in your app. Then change the filter to a more black and white/ sepia effect. Finally use a filter to make some areas more fuzzy than others.
Voila you have a spooky, ghostly figure.