Open stock3.jpg – or feel free to use a similar stock image or capture some splatters of your own (you’ll always find a use for them). The colour of the paint doesn’t matter. Go to Select > Color Range… again and select an orange colour (or whatever shade of paint you’re working with), with Fuzziness set to 100. Click on the Add to Sample eyedropper icon (the one with the ‘+’ next to it) and click again on the paint – but on a different hue of orange – until it’s picked up all the orange parts you want. Hit OK.