2009 D Bicentennial The Formative Years Penny Error?

First of all this is my first post to this forum and I'm also brand spanking new to coin collecting so if I use the wrong phrase, please excuse me.

I found a 2009 Bicentennial The Formative Years penny in my loose change today and when I looked closely on the back, it appears to have errors when I compare it to other coins.

I see 5 things that are different so I'm hoping someone can tell me if I do indeed have a errors coin.

I've attached 2 photos of my coin (one with arrows and one without) as well as a photo of a regular coin.

A) The hammer on mine has a horizontal line to the left of where the handle comes out the bottom.
B) Where his pants are tucked into his boots on his right leg, mine seems to be deeper and longer.
C) His nose is way different than the other coin.
D) At the bend in his knee on the right leg, the lines are again deeper and longer.
E) At the part tucked into his left knee, the wrinkle to the right much longer and deeper.

I'd appreciate any help I can get with this. Also, do you think I should clean it? I did soak it in hot water already to get a bunch of the grime off of it so I could see it but thats all I did.

Thanks, Karen