This is the way that i would do;
First draw a 3d sketch of the leaf when you are looking from the top. (press space and select top)
Press space and click front. You will se a line with a few dots. Grab some of them and move a little down and up. Especially dots. (to make more realistic look.
On surfaces tab, Click on Filled Surface and then click on the sketch that you have just drawn.
You will get something like that after you apply the feature. Then clik on thicken feature to convert it from surface to a solid.
Then google a leaf and make some illustrations for your model to use it as texture.
Drag drop that image to your model on slidworks and select face. Right clik on the leaf and you will see the face under appereances. Scale-move-rotate the texuter. And after everyhing you will get this. (you can do the same thing for the back)
You can edit the scene to have a nice render. Here is one.