Halo3 Skulls and Easter Eggs

OK I will start by say where are things:
(tips;the skulls cannot be found in easy difficulty but Easter eggs yes)

-Sierra 117 level we can found in order the...
>Blind skull(silver skull category)
>Marks on trees like "Jessica+William" or "I was here"
>Monkey family
>Lonely monkey
>Iron skull

Blind Skull
-The most easiest skull to found

We can find it [near the start of the level]at the first place where the loyalist phantom appear to drop troops at the right.Here is an idea of where you are:

#o############(¯¯¯) _########
#l-###########(¯¯¯¯]] D «-The loyalist phantom(enemy phantom)
- - ______######(____)¯########
(^you) ##|} #################
waterfall>|}################¤^ «-loyalist Grunt (bad grunt)
#######|}~~~~~~~~~~~~~~-|]

Arrived at the place the skull are there:


I will show others later ok?So you have the first part of my project.
Please don't reply until it is completed,if is not to complete the guide.