I love the block you are making and the greens are perfect. IMHO the peach is not the right color for the floral. If what I see is acurate the floral is more pink than peach so I would do a light pink w/ medium pink block or medium/dark pink block. I do like the light pinkish fabric but the peach is just not right. I would try another pink.
Keep us posted on your choice. I'm anxious to see the progression on this pretty block.
peace