hood/neck/(and maybe ears) question

so i was browsing the fursuit tag on tumblr for some inspiration when i came across this post

http://dapperwolfe.tumblr.com/post/40646490300/final-foaming-process-for-my-partial-person-in (this isn't my blog nor my photos.)

i want to try foaming a mask like this however i'm not sure how to make a hood/neck for the mask? i'm guessing i would need to make some sort of pattern but i'm not really good at visualizing these things.
(i'm also not sure how one would add ears to it. i can only think of extending the foam more over the head. unless i'm thinking of an incorrect ear positioning.)