These are nice sharp images. Are they cropped? The reason I ask is that you put your subjects right in the middle of the picture. From a purely compositional perspective, it is better to place them a bit to the right or left of centre so that it appears that they are "looking" into the "negative space" on the other side of the image. If you are not familiar with it, look up "Rule of thirds" on the web, or check this one out -
Bird Photography Tutorial 6: Basic Composition and this one -
Secrets of Digital Bird Photography. HTH.
WesternGuy