Zoo Game Design: Concept Art

I was asked to come up with the graphical interface, characters and buildings/scenery for an isometric Zoo simulator game for a mobile app. Therefore I was required to generate concepts for the game and basic interface design, to be able to make the developer get good sense of how the game will look and feel like.
For development stage of the project: https://iivanovsite.wordpress.com/chris-hart/zootopia/zoo-sketches-idea-developments/
For final outcome: https://iivanovsite.wordpress.com/chris-hart/zootopia/zootopia-final-outcomeevaluation/