Cars can be very tricky - the lines need to be very sharp, so there's no tolerance for blur. I used to mask and recolour car bodywork in Photoshop as a freelanc

Cars can be very tricky - the lines need to be very sharp, so there's no tolerance for blur. I used to mask and recolour car bodywork in Photoshop as a freelance job, and hand-drawn spline paths with the pen tool were the only acceptable solution for professional use.