Don't let the title mislead you. I mean, you'll see more than three photographs here. But when it comes to the species shown in the post, they are only three.
This is probably the Polydesmus angustus, a millipede from the Polydesmidae family. It's hard to be completely sure about the species because a couple of very similar ones are present in the same habitats.
I don't encounter this species very often. One of the reasons is surely the millipede's lifestyle. Polydesmus angustus can be found in dark, humid places. In leaf litter. In decaying wood and under the stones. I took these two photographs that started the post somewhere in the woods around the small inland town called Motovun. About 90 kilometers from where I live.
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This is the Phalangium opilio, an arachnid from the Phalangiidae family in the order Opiliones. I mean, it's a harvestman. That's the common name.
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To get this shot, I came a bit closer to the harvestman.
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For this photograph, the scene was lit in a different way.
The Phalangium opilio shown in this series of macro-portraits was found & photographed in the woods around the village of Valtura. Less than 10 kilometers from my hometown.
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In this last shot, you can see a beetle larva. Can't tell you the name of the species. The family is definitely Scarabaeidae.