Looks fairly good to me, but remember that Mark has about 5 versions of his autograph so there are many different IP scans to compare to which are all authentic, but these are my most recent ones from a few weeks ago:
http://josh.fotopic.net/p52311360.html
http://josh.fotopic.net/p52311370.html
His autograph last season on the whole looked like an "M" and a line. Year before didn't have the looped part on the "Viduka". So he changes it often.