Separate each of your plastic eggs into two halves.  Trim the small piece of plastic that connects them.

The orange half will be the bottom.  Use the more rounded half of that egg.  Glue your marbe into the bottom of that egg half.

Put your egg together.  Use your push pin to make a small hole where his pipe cleaner ears will go.

You will likely need to make the hole a bit larger to insert the pipe cleaner.  Use your embroidery needle to do so.  You will want to make a hole on either side of the egg.

Cut the "bumpy" part off of a green bumpy pipe cleaner.

Insert the pipe cleaner into the two holes you just made.  You may need to use your pliers to pull the pipe cleaners through the hole.

Use your marker to draw Baby Yoda's face on the green egg half. 

If you have small pom poms you can glue those onto the egg to represent his hands.