Constructive criticism and advice on my poem?

You might reconsider your use of 'on' to end two lines. I think the first use suits the poem best. As for a suggestion, you could make use of the words 'overlook' and 'oversee' which seem similar but are opposites. Also, if you have nothing against puns, you could use the word 'blanch' in reference to your fear as a white pawn. Good luck.