Didn't want a battle,
Yet you declared war,
Each knock you gave me
Made me stronger than before,
I will not give up,
I will not give in,
You won't make me fall,
I won't let you win.
A short poem may be a stylistic choice or it may be that you have said what you intended to say in a more concise way. Either way, they differ stylistically from a long poem in that there tends to be more care in word choice. Since there are fewer words people tend to spend more time on choosing a word that fits the subject to perfection. Because of this meticulous attitude, writing a short poem is often more tedious than writing a long poem.