Yes it is normal.
There are two types of men (stemming from two types of boys). Type 1 likes to have attractive women draped all over them because we are attracted to those women. Type 2 wants to act macho, be with the guys all the time, etc. Your brother appears to be type 2.
Abnormal would be a "Girls rule the earth poster", and only then it would be abnormal if said poster did not have hot women on it.