Pulling out not-quite-right stitches:
If you make a stitch or two in the wrong place, take your hook from the loop and pull gently on the working yarn, and the stitches should undo easily. If you don't feel confident about designing as you go in this manner, you could sketch a few winding lines onto the canvas to use as a guide. Change to another yarn, and begin to fill in more of the area.
Continue in this manner (figure B) until all of the mesh is covered.
Corkscrew flowers:
Using a smooth, thin yarn, chain 10 stitches. Work 4 dc into each chain (figure C) and finish off.
Gently roll the piece up to form a flower shape; stitch it at the back, being sure to catch each round securely.
You can create various-size flowers by starting with a different number of chain; by changing the number or height of the stitches that you work into each chain; or by working a further row of sc along the length of the corkscrew, using a different color.
Leaf:
To create a leaf, first make a number of chain stitches and then work a row of stitches that start out small but gradually become taller toward the middle of the chain, and then graduate back down to small stitches again.
Work a couple of single crochet stitches into the last chain and do not turn the work, but continue down the other side of the chain in the same manner to complete the other side of the leaf (figure D).