It looks like Mr Grumpy is not at all happy with the food he’s been given – maybe it doesn’t have the fruity flavoured suet pellets he likes best.
Perhaps Mr Grumpy doesn’t like the fact that the food has been tucked into a crack in the wooden post – maybe that makes it too hard to get at.
Or perhaps Mr Grumpy is really Mr Fusspot or even Mr Lazy in disguise.
Mr Grumpy is certainly glaring very rudely at Ms Happy.
Unfortunately, Mr Tickler is nowhere to be found so there is no way to make Mr Grumpy less grouchy so I think Ms Happy will just leave him to wallow in his bad mood all by himself.