4 medium size graphics for webpage

I need someone to design 4 graphics for me, all approximately 550 x 350 pixels. The images need to blend / look professional with the website we are currently designing. Attached is a sample graphic of one we are using. Description of the four graphics needed: 1. Picture one is under the heading "Professional services" , we are thinking something like two hands shaking / a boardroom setting, etc. Open to your creativity and input 2. Picture two is under the heading "Free signup" , we are thinking having a white man signing up at a computer, etc, again open to your creative interpretation 3. Picture three is under the heading "You save time and money", we are thinking about having an African American women throwing up a bundle of money 4. Picture 4 is a graphic for our "sign up" pop up screen that will incorporate the wording we have already. Again, importance is that the pictures work well within our current site design's color scheme (we will show you the site prior to you starting design, nothing out of the ordinary on it). We would like to have these graphics asap and money of course is an issue, please bid and if you have any kind of portfolio / sample of graphics you have designed that would tremendous help. Thank you.