Design game art and ui

Hi! I want to hire a person who will design game art and ui for my mobile simulator game sequel about ants. First version of my game has pixel art style, and I also want to keep this style in sequel, however I want to use more accurate, consistent, contrast and appealing art. I will provide all details and screenshots of current game, so You will have an example of what I'm looking for. Current game is made from about 80-90 game assets (ant and other insects sprites, trees, bushes, ground layers tiles, ui buttons etc.).