I really don't like the flanger in the beginning . Takes alot away from the power that the orignal had. You're playing the bridge parts wrong, off time and everything. Verse is ok, pinch harmonics get annoying on the other bridge part.

I really think you overkilled the harmony bits as well. Harmonies are great, but too much of a good thing usually doesn't turn out well, there's just too much. Takes away from the special thing that Iron Maiden put together here. I think you should just keep the harmonies where they are in the original and maybe throw an extra in on the lick before the song gets fast (part at 4:12).

The guitar solo was pretty good. Nice.

Overall, I think you should work on your rhythm playing (for the riff that you ALWAYS harmonize ). Other than that, you're doing great.