Just touch it up, unless it's down to metal. Looks like you've still got primer there.
Don't feel bad, I was helping to dig out the car weekend, a brand new 09 Honda Civic that we've had for 5 days, and also hit it with a shovel. The odometer says 80km

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Luckily! I wasn't shoveling when I hit it. I was trying to get the driver's attention while she was adjusting the position in a snow filled spot on the street. I stepped closer and forgot I had the shovel in my hand, so I bumped the rear, left door panel with the round, steel handle of the shovel. Initially, I freaked out cause I saw a really small, ball-point pen sized dark spot where I hit it. The next day, someone checked the car and said there was a needle sized dent. I checked it again today, and couldn't find it. To the best of my knowledge, I left a very small dent, that was 'dark' cause it was night causing a shadow.