I absolutely love this! Her pose, how she looks the colors, just everything is perfect! This looks like a lot of effort has been put into it, and the combination of colors makes it stand out. It caught my eye straight away. Probably the only downfall is the background, as it is quite bare, but then again it allows the viewer to focus on Chell and how beautiful she looks! (As a side note I just want to say how much I love the way you've drawn her shoes! You really made sure to captivate all the detail.) Good Job!