Round 2: *chain 4 and (in the 1st st) tr2, ch3 and make a sl st* (in that same stitch).Sl st into the next stitch and repeat the pattern from * to *. Make 5 such petals.
Ch10, sl st in 1st st, sc1 in next, hdc1 in next, dc1 in next 3 sts, hdc1 in next, sc1 in next and sl st in the last st. Ch1 (we are going to work the other side of the leaf in reverse), and sl st in 1st st, next sc1, hdc1, dc1 in next 3 sts., hdc1, sc1 and sl st at the top. One leaf made. Now ch12 for the other leaf. We added 2 stitches more which are to be left as are, and their purpose is to make folding the leaves easily one, slightly over the other. Repeat the leaf pattern for the second leaf.
For the accents, ch25 and tie both ends. Make as many as you'd like to have in your brooch.
Make as many of the crochet parts as you like. Play and experiments with arrangements of the flowers, leaves and accents you've made. When you are satisfied with the look of your brooch, sew small parts together first, adding other parts as you go. For example, I always sew the leaves onto (or under the flowers first) then I add another flower (with leaf / accent) to the first, and slowly add up and join pieces one by one. When done, attach / sew a brooch pin at the back. You might want to add a felt / textile piece at the back to cover it before applying the pin.