First open a new file on Adobe Illustrator (1000px by 1000px). Draw a circle using Ellipse tool like my below image.
Set gradient color and stroke color like my image and stroke value 4.
Create 2nd oval like below image.
Reset 2nd oval gradient color like below image.
Now create 7 oval reset different gradient color and some solid color like my below image 1, 2, 3, 4 and 5.
Create 6 other oval and placed it like below image.
Draw some line like below image.
Draw a mouth shape like below image use pen tool.
Create a shape use pen tool like below image.
Draw some oval using solid black color and reset like my below image 1, 2 and 3.
Now draw two oval and two line and reset it like below image 1, 2, 3 and 4.