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What makes OP's pic bad is that Sun and Moon's camera angles don't have portraits in mind. Along with that, the portrait used in the image gets in the way of what's going on behind it.
Other games that use portraits, if done correctly, still have the characters express themselves through models, but have the portraits show the character's facial expression. Here, the character speaking is slumped forward, talking to the player character, which shows his body language, and the upset portrait shows his face.
Even the side series Pokemon games sometimes make use of portraits, like Pokemon Mystery Dungeon. That game also does a decent job at it by making them small, so they can be placed in areas that don't detract from what's going on.
