Jar & feeding, mostly nymphs, labium straight
Not the "typical" position, bed bugs stretching and feeding and basically feeding while lying down on their backs. See close-up insert of whole bug, front legs not holding onto substrate. They haven't used their front legs to hold onto the skin so stylet fascicle not deeply inserted into skin and labium is not bent. Red skin color is basically a birthmark, a nevus, but small red dots are from previous feedings by other bed bugs.
This feeding posture does not fit that described by Usinger (1966) Monograph of Cimicidae, Chapter 3-Bites, page 34 and figure 3-1 on page 35. Maybe the "typical" position is not the most common position assumed during feeding.