Vectorize these images for me using Illustrator please

I have two small projects I need done: 1)Attached is a photo of Barack Obama. I need his face in this photo to be vectorized. I want two versions of the vector image. The two versions should be like the two images attached. I did those two images using Illustrator, but I think I could've done a better job. If you have any ideas for making the images look better, feel free to try it out and run it by me. I value your artistic input, seeing as how I'm not much of an artist myself. You can do this work fairly easily using Adobe Illustrator's CS4's Live Trace feature. As a final product I need two Adobe Illustrator (AI) files, one for each version. The images in the files need to be vectors. Version 1: The parts showing up as WHITE in my image need to be transparent in the final product. Besides that, the only other color can be black. No other colors or greyscale. Version 2: The parts showing up as BLACK in my image need to be transparent in the final product. Besides that, the only other color can be white. No other colors or greyscale. 2) Attached are two images of Ronald Reagan. I need these images vectorized as well. I want them along the lines of the 3rd reagan image attached. In the final product the only colors should be white and transparent, no greyscale, though. If you bid, please PM me a link to your online portfolio if you have one. Bidders with impressive portfolios, especially which include images similar to those I'm requesting here, will rise to the top. If this works out, you can expect a lot more work from me in the future. I need a lot of simple graphic design work like this done. Thanks.