Your setup should ideally have room for 2 hides, one on the warm, one on the cool side. How are you maintaining heat and humidity? Also, I see no air holes, which is for sure important.

The Pastel might be a little skinny, but if it is eating, that's key.

When getting ready to shed snakes will dull in color, their eyes will "go blue" and form a gray, misty shade between their current eye cap and the new one. They will continue to dull, their eyes will clear up a day or 2 before shed, then they will shed. Some kind of wood or rock like surface would provide a good surface to scratch on for shedding. Though please don't use and old rock or stick they may not be clean, bug free, etc...

However, if these pictures are recent, neither appears to be in shed.

And to me, those look like mice, though I hope someone else can chime in on the size names, I just know that I feed mine a mouse slightly smaller than her largest body width.