On the golden face mutation you will notice the yellow on the head, cheeks and face is very rich and vibrant in colour and is almost the same intensity when compared to a yellow based, green series budgie. Depending on the bird being double factor or not, the yellow can (if single factor) spread into the blue feathers.
Just as an example, here's my Goldilocks, notice the much richer tone of yellow on her.
The yellow face budgie has a paler tone of yellow that may or may not spread into the blue feathers, depending if the budgie is yellow face I (yellow will stay mainly on the face) and on yellow face II where the yellow will spread into the blue making it more greenish.
And this is my budgie Leonel, he is yellow face type II
To put a profile pic you need to go to the User CP, you can find this on the top left bar titled User Menu. You can also reach this by going to your Badge, press on My TB and choose My User Control Panel.
On the left you will see Your Control Panel and on the 1st section Your Profile. From there click on Edit Profile Picture, upload your pic and save your changes.