Looking for a source for Valence/Arousal values Russell's advance circumplex model of emotion?
Circumplex models of emotion with the dimensions 'arousal' and 'valence' are not grounded with neurobiological support.  

There is however an alternative 'atlas' model with two dimensions that does have neurobiological support (Mobbs, 2020).  The atlas model uses the dimensions of 'affiliation' and 'dominance' with broad emotional categories as shown below.  The atlas is supported with a catalogue of over 3000 emotions each with precise coordinates. 



The facial expressions for each location in the atlas is shown below:



Mobbs AED (2020) An atlas of personality, emotion and behaviour. PLOS ONE 15(1): e0227877. https://doi.org/10.1371/journal.pone.0227877