I think the photos have potential. There are some compositional and lighting problems, but with time, I think you can work those out. #4 is too dark and lacks enough contrast. #1 has the horizon line going through the head which is usually not a good idea. I like #2 the best, but the lighting is a bit hot and you have yellowish cast around the eye area. Also, #2 is cropped a bit too tightly. #3 is the second best shot and I think the best composed of the bunch. #5 is not a very good pose and the eyes look odd somehow because of they position.