iOS Game Graphics

Hi, my name is Lorian and I am in the process of developing an iOS app. As the project nears completion, I have decided to hire a designer to give the graphics a professional touch; my crude attempts at graphic design leave much to be desired. There are around 200 individual graphics to create, but all are simple and 2D, and many are very similar. Also, for each graphic, I will provide the corresponding graphic that I have made myself. First and foremost, I want all of the graphics to be made to a common colour scheme, and to the same simplistic style; my current graphics are a little mismatched. Please also suggest a few fonts and colours that would go well with the graphics. I expect all graphics to be submitted in a large .png file format, and it would be great if you could keep them yourself in your favoured format; should there be the need to create further graphics for future versions of my game, I would like them to also use the same colour scheme and style. I would like the graphics to be finished in 1-2 weeks time as my preferred release deadline is 25 June. If you are interested in taking part in my project, I will give you my *Removed by Admin* and we can correspond further. However, I will only be able to answer after 16:00 GMT on weekdays. I have included a few of the existing images to give you an idea of what kind of graphics you will be creating.