Your door mouse has cranberry genitalia
Not sure if it's the placement or the colour of your signature, but it's really distracting. I'd say it needs to go closer to the colours in the door mouse. Otherwise your colour and tone is very strong. I kinda also want to see him holding onto the branch with his hanging foot. It looks awkward as is right now.
Its funny - but that never even occured to me (concerning the berry genitalia) - Must be according to the vein your mind runs in.
As for how he is holding on, I would think it was meant to look a bit awkward - he is clinging to a branch, not taking a rest in a clump of grass - I think it very well conveys the idea that he might fall at any minute!