I think that is bloody good, And if it's unsharpened then it is advisable to sharpen as the image does loose some during resize. I downloaded Matts TPH action and that does the job well enough for me, it resizes and sharpens, all I have to do is press play. Great stuff. I know there is no substitute for learning how to do this myself, but like you say one step at a time, and taking a better picture is priority.
The ooof line? thought that was a noise that was made when you got kicked in the nuts on the floor don't bother me either

, I meen that's why it's there. Really good shot and @70mm, you must have got some really good close ups?
Well done.
Ken.