This is absolutely beautiful!!!! I LOVE it!! You are a great writer... I love the flow of this poem, the words, the imagery, how it was said and put, and how you put it together... Brilliant!! Truly magnificent =)
Take Care and God Bless,
Sarah-Joy

I thought a lot of the images were very strong, but I also feel like the repitition was only effective during certain points, and otherwise just served as a reminder of the title to the reader. For example, I felt that the third and fourth stanzas were significantly stronger than the second because they only have one line that starts with imagine, and it's the first one. The constant prompting to imagine can sort of take away from the whole imagination process.

Don't get me wrong, I think this poem is a good one as it stands. I think you could improve it though, simply by editing your poem in a way that would remove some of the more superfluous 'imagine's