Sharp and well exposed. Good head angle.
The bush is very interesting, but does compete with the bird for attention.
I might consider a crop up from the bottom, and a small crop from the right. I would also tone down some of the brightest leaves, esp. the one right in front of him.
For my taste, the blur on the background is a bit much.
Some may comment on the light angle being well off to the right, but I think it still works because of the head angle.
Richard - I agree with Randy's comments - a nice pose and the image is sharp and well exposed.
I would have a look back at your post processing - it looks like the masking was a bit sloppy - some of the blur has spilled over to the beak, head and back of the bird and the leaves on the right and there is also a strange artifact in the background in front of the bird's feet. I would also consider a reverse S-curve to cut the overall contrast a bit.
I've developed a fondness for sparrows for some reason :)
I like the composition, head angle, exposure.... unfortunately the background blur appears to have encroached upon the edges of the bird, such that they are no longer well-defined in certain places (on the top/back, near the beak). Gives something of a halo or ghostly effect.