I had to look up the word Poesy, I had thought it may have been a play on words reference to Edgar Allen Poe firstly. That's the new thing I have learned today!

Anyway, to the poem. What I like most of all I think is your punctuation: it conducts the reader to read in a nice flow, and I think it helps the rhyme work in the first stanza too.

'all is possible in a poets dream'
^^
Nice line, I like the word dream in poetry and you use it well here. It is true also that all is possible and I think you may be talking about imagination here too.

'a creation of pure beauty' - I didn't like this line as much, it is a little lazy. It works but it isn't very original. It is better in general to show us that something is beautiful, rather than tell us. There's a quote that goes something like this: 'The average writers tells, the good writer shows.' Saying 'pure beauty' is like a journalist saying a football match was simply 'good.' He would be expected to say how the match was good, not just that is was good. That doesn't apply to just this poem, but into the future as something to consider, even though every poem is different.

'an art of write.' - This doesn't really make sense to me if I read it: I know it is meant to be a play on words, but it left me a bit confused. It was a bit of a let down as the end of a poem is vital as it sticks in the mind of the reader as the last impression of the poem.

Other than that, it was a nice, simple piece that describes poetry well, in all its power and variety. I'm glad I came across this and I think you have some potential, and looking forward to seeing more from you!