Looks like a little oil mixed with water? It generally doesn’t take much of an oil leak to make a big mess like that when it rains. It’s hard to tell in the pic, but if your concerned that it is leaking a lot, there should be some tell tail signs under the car
I’m not sure but would doubt I little over full of oil would hurt, unless it was excessively over full. Did you give it a good old fashion flogging when you picked it up? Lol Can you see where it may be leaking from? Maybe some oil was spilt when filling? And has worked it’s way down somewhere and dripped onto the ground
Have you checked oil level? If it's only just been serviced it could be leaking from sump plug or oil filter. Or hopefully just spilled oil. Also check your power steering fluid level.
Ended up being a loose power steering hose. Weird it happened now as I got the pump put on a week ago.