That shadow is from the little yellow lifeguard truck that yours is overlaying. A proper build-up of layers would have been: the beach, the driver's side exhaust, the surfboard, custom wheels, the truck, the passenger's side exhaust. I use so many layers trying to get something to work that the file ends up over 2MB even though the exported JPEG is only 56K or so.
BTW, notice my new avatar? Old photo from before I started tearing the Olds down. 1Fast65Elky's 'rechroming' of the grill in images in this thread has me debating, again, about whether to keep the grill and bumper or replace with something fabricated. Whole lot cheaper and easier to try out ideas here than on the steel.