It looks like the ash absorbed most of the oil. Did you reburn the ashes?
I would take a look at that leak.
What oil it didn't entirely absorb is probably too far down onto the surface of the concrete that the ash couldn't suck it up, but it sure is not slippery with that fine layer of ash I couldn't get completely with the broom.
That leak occurred AFTER replacing the oil stand gasket and replacing accessory belts, and apparently resulted from another gasket that went bad inside the oil filter housing--why they just didn't replace it when they did the original work I don't know. But they came to get me where I stopped the car (when oil light came on, on my way back to their garage, despite adding 1.5 quarts a mile or so before), replaced the gasket inside the housing, topped off the oil, and stayed late at their shop to clean it up. They removed the oil pan, degreased and power-washed it, and power washed the engine compartment. Much appreciated by me, until about 15-20 miles later when the battery/alternator warning light came on, then went out when multiple other warning lights came on. I figured things were wet from the power-washing and would dry out. However, the car wouldn't restart where I had (foolishly) shut off the ignition, about 15 miles from their shop. I called them, they sent a towtruck and a driver in another car to take me and my three kids home, after stopping on the way home at Goodwill for us to donate clothes. They flatbedded the car back to their shop. They "discovered" that the alternator was bad, but replaced it free of charge. I can't help but think that their powerwashing the engine compartment had something to do with the alternator failing--apparently they think so too, because they replaced the alternator free of charge, both parts and labor. The tow, and two trips to me where I had broken down/stopped the car, were also free of charge. Major hassle (thankfully I am off from work this week), but I appreciated very much how they have made things right, without charge. Before I picked it up this AM, they took it for a 30 minute test drive, reportedly problem-free--finally.