I thought I should preview what I've got so far for the goblin for suggestions. I'm not sure there's much more I can do manipulating his facial features given the limitations, but if there's things that bug you, let me know and I'll see what I can do about adjusting them.
I would like to turn the ears a little like in your pics, and not have them so symmetrical, but there's nothing I can do about that really. I'll see about trying to get rid of the black lines on the teeth. I had a similar problem when I elongated the teeth for my Grimgor leaderhead.
The eye colour is just temporary, unless you like it, and the skin tone is temporary. Do you want it as orangy as the pic you posted, or would you like it a different colour/shade?
About hair. Do you want me to try to replicate the hair in the pic, or do you want a different style?
Finally, clothing. Do you want the clothing as close as possible to in the pic or did you have something else in mind.
I'll get back to you about the background when all else is sorted.