First time studying squirrels! They're a bit odd. Especially those feet. I fear those feet.
From what I've observed, they seem really slinky, like ferrets. They scrunch up real tight when eating or sitting, but the moment they start moving they turn into a fat, furry noodle.
Their paws are... something. Very elongated with slender fingers/toes. Their pad placement is a bit weird but whatever, that's nature.
I wasn't sure if you wanted a whole rundown on squirrels, so I just focused mainly on the pose you gave. Hope this helps!
(If you're looking for some adopt inspo for these fellas, check these guys out!)