The photo is pretty sick. Out of those the best one is the first one, but I'm not sure about the text. The others looks horrible, trash them immediately. The background on the first one looks the best, but it would be more suitable if say there were some hospital beds in the back, making it convincing. Your dimensions look way off, you can't design a cover like that. Design the cover @ 4.75 x 4.75" @ 300 DPI CMYK, and leave a .25" bleed making it 5 x 5".