Hi,
I have been involved in game art asset creation for more then 9 years. Please check my portfolio, there you will see:
* Pre-Production Concept Art
* Pre-Production Gameplay concept in After-FX
* High Quality Character design in both 2D and 3D
* Illustrations
* Hand Painted Textures for TMX Tilemaps
* 3D and 2D Renderings for GUI elements
* Gamecenter achievement implementation with achievement graphics and code implementation
* Chartboost integration with campaign creatives designed from scratch to fit your game art-style
* iOS Game marketing campaigns (Youtube video Trailers, Web Site, Banners, Chartboost Creatives, etc)
* 2D and 3D Animation for SpriteSheets in Cocos2D or Bone animation in Unity3D
* Avarage Level Programming experience in Cocos2D (Objective-C) and Unity3D (C#, Javascript)
I'm sure you can find the value in hiring someone which can provided all these services for your iOS game.
Thank you,