Hi aerodisiac
Thanks for your advice and comments.
Those links to hyperreal versions were nice, I especially liked the Buzz Lightyear one.
The surfaceLumpiness is mostly due to the rake and clay build up brush, which I use on the lower levels to block out the form ( as you justly said in your advice)
I tend to go back and forth in the sculpting process( from high to low) so I can see how changes work out.
I have shortened the neck a bit and made the ears a tad smaller and defined the lips somewhat better in the last image.
I also have a lot of images of human anatomy so it’s not lack of having enough reference, it’s more the lack of skill that is the bottleneck here 
If there is anything specific that stands out please do a drawover so I can have a look at it myself.
And finally…yes I know it’s hard to do a "real"version of something cartoony but it is also open to creativity since you can use your imagination to figure out how something looks in real life.
Again thanks for commenting, it’s much appreciated.
Martin