Julie,
Successful hummingbird shots require sharpness, a frame-filling long lens, a moderate depth of field, a non-distracting background, and a lens that has minimal optical defects that can distract.
What I like about your first shot is that the bird form looks interesting. It also fills up the frame just enough. Unfortunately it is simply not in focus. Then the leaf obscures part of the bird. Then the background is very distracting. The overall image is also quite flat and could use some more contrast and pop. The color balance is also off, it is too green-blue.
The second one also have an interesting POV. But the lighting is too weak, especially against a light background, plus the leaf is sharper than the bird. The background is way too distracting, the mixture of white and greenish forms gets me a tad nervous. Do you see how the bird gets lost in the background? The better shots have discernable separation between the subject and the background. You want to make it easy on your viewers' eyes. That also means not too many stray branches, leaves, buds etc. Sometimes they have to be cloned out. The bird is also too small within the frame.
Ultimately luck plays a significant part in great bird shots. But that's nothing new to photography
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M