"Often I sit and ponder how,
How can so much beauty fill your heart,
So much in such a small space,
There has been only you from the start."

Second line: Change to this for a smoother read:

"How so much beauty can fill your heart,".

Otherwise, this was a good opening, I can feel the emotions given off already.
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"For there is a great expanse of love,
And it fills every inch of your skin,
You must be on bursting point,
My Heart, I wish I knew where to begin."

Third line: "on" would sound better changed to "at".

You expressed yourself very well here, that last line really had me going though, had me reading on.
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"You seem like a ship in a bottle,
So many intricacies packed so tight,
My ship in a bottle ...
Such an amazing sight."

Great depth here, and I love that word "intricacies", very unique. I don't hear that word all the time.
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"You kindness flourishes my heart,
You grow where I though all were dead,
Caressing my torment tenderly,
Within my skin, your love's embed."

In the first line, "You" should be "Your".

In the second line, maybe reword to this:

"You grow places I thought were dead,".

The last two lines of this stanza were my favorite, so much passion is portrayed here, nice job so far. I just love that word "embed"!
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"The aura of your sweetness,
It flows throughout my world,
Filling me sense by sense,
You make my love unfurl."

Excellent job, this is a touching piece about someone deeply in love with his soul mate.
Well-expressed emotions and feelings.
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"Never can I give up hope,
Faithful is every breathe you take,
For I shall treat you tenderly,
You are my snowflake."

I didn't really like the repetition of "tenderly", since you already repeated it above.

The last line, in my opinion, was a bit more personal, like that is your nickname for her. Because I've never heard that used before.
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"You seem like a ship in a bottle,
So many intricacies packed so tight,
My ship in a bottle ...
Such an amazing sight."

Good repetition, it didn't bore me but added a nice touch.
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"With a smile as bright as the sun,
Your happiness fills my soul,
Filled with a joy rivaled by no other,
Only you has the key to my heart hole."

In the first line, I was a bit disappointed because that is a cliche simile and I was hoping for something more original.

In the third line, you repeat "fill" which threw me off, maybe change to the second line to this:

"Your happiness feeds my soul,"

In the fourth line, "has" should be "have".

I didn't really love "heart hole", it just sounded a bit odd to me, but that's my opinion.

That way, there is no repetition.

And then to end it up, the first stanza...

Overall, 4/5 from me, there were just some rocky spots where I think you could be more creative. But otherwise than that, this was a powerful and heartfelt love poem, good work.

Take care and God Bless You!

~MaryAnne