Design an App Mockup

I am an Iphone App Developer and i need someone to design the graphics for My app. The app is a simple game where users can pop bubbles and collect power ups in a certain amount of time. The app is almost complete from a coding point of view and i have a very clear idea of what i want. The app 's target market is kids to young adults (8 years to 25 years) Things i need done 1. An app icon conveying the theme 2. Launch screen conveying the theme 3.A simple Main menu integrated with the theme containing graphics to hold the following buttons: a. Start Game b. Tutorial c. Options [login to view URL] please note that the text is dynamic and added by code so what is needed is just a graphic to place it in like a transparent bubble for example) [login to view URL] main game scene containing the following: [login to view URL] image (with walls or something similar in place of the blue rectangles and with pins or a barb wire in place of the red rectangle as shown in most images) [login to view URL] (three sizes and colors as shown in most images) Some power ups similar to bubbles in size including [login to view URL] Barrel graphic (in place of the black rectangle in Image 2) [login to view URL] Flake graphic (in place of the white ball in Image 3) [login to view URL] graphic (in place of the ugly dynamite in Image 4) [login to view URL] graphic (in place of the ugly star in Image 5) [login to view URL] graphic (in place of the whitish-green ball in image 6) Four buttons for the pause menu shown in many images: 1. Resume Button 2. Replay Button 3. Home Button 4. Pause Button A game over screen as shown in image 7 This screen only needs a background for now and probably the same replay and home button used in the main game scene. And is before the text is generated by code. I understand that many of these shapes are basic and i do not mind someone getting them from shutter stock or similar websites, i just need someone to put it all together for me and create a good looking app. I can also send a download link for the designer to test the app on his phone while designing to get a better idea.