Both of these are very soft and lack fine detail. Are they big crops? This could be the reason for the loss of quality.
The composition needs a little attention too. If the bird in the second was framed as the bird in the first is and vice versa, that would improve things imo.
I can'r see any exif so I can't comment on any settings which may be effecting the over all sharpness and iq of the images.