Wow--so, my first impression was of the overall strength of your wording. The rise and fall given by breaking the sentences in the middle or thereabouts helps this a lot; it makes me want to jump immediately to the next line, i.e., keeps my interest. The imagery used is vivid, and I love it, from a literary view. Your thoughts are complete, coming around at the end to your original idea, in otherwords, your first sentence and last two lines state the same thing, which makes your poem sound and complete.
I would say that at the beginning of each of your lines you either capitalize all or don't capitalize all of your lines--one or the other, no switching between both. A capital letter in the middle of the sentence might not make sense to the grammar student in you, but it looks much better in the overall format of the poem. Also, you may want to look into the way you divide up your sentences; I think your poem would flow more easily if you had the same number of words or syllables per sentence. The great thing about writing, though, especially poems, is that you can do whatever you want, really. I absolutely love the theme of this, the wording and the way the words seem to leap into a circle themselves. It's hard to say anything that really needs improvement.
By all means, keep writing, and I hope this helps.

Vision: Your poem envisions a state of insecurity and worry. The constant change of any state is always in doubt and your poem touches upon that theme. A statement of potential inner turmoil or question of your own outside world. Certainly a darker poetic piece than the average general poem.

Your vision is a sound one. 4/5

Originality: Your poem holds key states to show its theme over and over again. Many of these states start out as something pleasant only to change to something negative.

Unfortunately for poems there's less room for originality when dealing with a typical constant theme or subject. Especially in emotional and dark pieces. 3/5

Technique: Free verse, the easiest type of poem as there are no true rules unlike other forms of poetry and of course literature of the Prose persuasion. So traditional grammar does not apply however, separating everything to its own individual line may make your words and meanings clearer or more precise.

"Nothing lasts and nothing is forever
Whether it be monuments or the Written word,
everything eventually crumbles to dust.
Holy texts become Myths,
young lovers grow old and Wither away.
Countries rise like a phoenix reborn,
only to collapse.
Warm hands turn to ice
and kind smiles turn to venomous hate,
From the first snowfall tot he first day of spring
everything is in a constant change
with nothing staying the same."

again grammar usage is not so important so Capitalizing key words can be used at various points of a Line of which is used in this piece. 3/5

Impact: Despite issues with technique requiring potential improvement (it's there, you certainly have the talent to do so!!)or the constraints of a constant theme that's hard to wrestle and put into a form of originality the vision of the artwork along with personal messages that are placed within the poem allows a reader to connect and understand both you, and the poem and still allows room for self interaction and exploration due to thought provoked by your piece.

There is room for improvement but then again that's almost always true of almost everything. I hope you find this Review helpful even if only minor-ly so. Again you have talent, and any time there's room to improve that means you can improve your craft and put together better more emotionally impacting pieces that can be moody & deep or just down right breath taking. I like some of the states such as Holy texts becoming Myths, and countries being likened to phoenixes as they ring or can ring true and so impacted me grater than Kind Smiles to Venomous Hatred. I would have gone with something like a disparaging look... You also double spaced between venomous hate, so that detracted from the immersion into the poem, but only a little bit.

Overall i give your poem a 4/5