I think they're wonderful first attempts, Kai. Thanks for showing them here....  Like Richard, I'm a bit  surprised there's no vignetting. All the  pinhole images I've ever seen, (  which were always from photo 101 classes, lol ), always had that...Then again, they didn't have your skills to begin with... :^)

The best advice I can give you is. . .  always listen to Richard's advice, lol. 

-M :^)

Marlene <")

Marlene S. Piskin Photography
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"A new study shows that licking the sweat off a frog can cure depression. The down side is, the minute you stop licking, the frog gets depressed again." - Jay Leno