1 is a tad bit over exposed, the composition is not bad but i would go tighter on the flower, focus is good
2 is not bad but doesn't really do anything for me
In 3 were you going for the out of focus bird and blurred wings? If so, that would work but I think you need to be in tighter on the bird.
4 is the best, though a tad underexposed and would be nicer if you weren't shooting down on the bird. and again, get a little closer in, or try a crop.
Overall not bad for a beginner, keep at it.