The first stitch that comes to my mind with the thought of embroidering a leaf is the Fishbone Stitch. It is from the family of crossed stitches. Here is the fishbone stitch and its few variations worked on leaves.
1. Fishbone Stitch
Bring the needle up at the tip of the leaf.
Pass the needle at the point shown above on the central vein to a point just next to the tip on the left side.
Now, pass the needle from the central vein ( a little below the 1st stitch) to the right side just next to the tip of the leaf.
Continue working in a similar way
Leaf half done
2. Raised Fishbone Stitch
It is also called as overlapping herringbone stitch / self padded herringbone stitch
Bring the needle up at the tip of the leaf. Pass the needle from b to c
Pick the fabric very close to the tip from 'e' to 'f'.
My daughter made some of it in the school and we modified it by adding the wings antennae and those eyes. Isn't the ladybug cute.
Plastic water bottle ( bottom part, the cap and curved side for the wings )
Poster colors (Black, white and red )
Small piece of newspaper for the antennae.
Glue ( anything that sticks plastics)
Cut the bottom part of the plastic bottle long enough that the cap of the bottle can be fixed easily on one side. Cut the wings from the top curved portion of the bottle and shape it accordingly. Paint the inner surface of the body parts with red poster color . Let it dry properly. Add black dots on the outer surface of the plastic . Paint the cap with black poster color. Paint the eyes Roll the newspaper tightly and fold and stick one side ( as seen in the picture) to resemble antenna. Paint the antennae with black color and stick it on the head using glue. Glue the parts together.
I selected Horizontal and Vertical Moorish Lattice pattern from the Interlocking Crochet book. The first two rows were fine but from the start of the third row something was not right and I tried few times but was not getting the same pattern as shown. That is when I saw this page. The correction for the pattern was given here . From then on crocheting was just wonderful. Tanis Suggests that you print the corrections page and add it to the book. (https://interlockingcrochet.com/interlocking-crochet/)