I reckon that beginners become too critical of their own work too early. Everyone of those shots are acceptable for a beginner, dare I say excellent. Backgrounds are important, and that is also something that I am only just starting to consider. Some of us beginners, maybe most of us compare our work to those of the intermediates, and advanced members, which just isn't fair upon ourselves. These guys have been learning/honing their skills our many years, maybe decades! I dont know what gear your using, but typically beginners start with entry level cameras. Have a look at the exifs of the better photographers photos, they are using far better gear than beginners generally do. Guess what I am saying is.........you cant rush it, and don't be too critical of your work