Ooh! You're working on a JTTW adaptation?! That's awesome!
So, about Wukong's design, here are some of my notes:
First of, I think his face should not look humane. He's a monkey, and supposed to be a scary looking one as described in the novel with those who saw his face and commented on how he looked like the Thunder God. And to be honest, this is one of the things I dislike like about JTTW artists, and that's giving him a normal human face instead of a monkey's.
Next, here's a question: Is he going to have a long tail? In some translations, Wukong is described to be a Macaque. And Macaques are Asian monkeys and they usually have short to medium length tails. It's acknowledged that Wukong has a tail and he can't transform it, but if we're going to be specific, his tail is not long.
Next, his outfits. He did not start and remained in one set. He had different ones throughout the story.
First his monk outfit in his early training days (Red in the novel):
Then he got his iconic golden armor with his cap with the two phoenix feathers that he got from the Dragon Kings:
He got another outfit when he was the horse keeper:
In the pilgrimage part, he started with his most well known outfit. The one with the tiger skin.
At one point, he was going to have this hat on, but it turned out to be a trick to put the crown on his head.
As time went on, he wore different outfits, but yellow remained his primary color:
And now for his weapon, the Golden Hooped staff. From the name, you can tell it got the color gold in it. Now, in these illustrations, the staff is golden.
There are some who make it all red as an homage to Dragon Ball, but that's inaccurate since the "Golden" part of the name becomes pointless.
Lastly, and even though you pointed out that you're taking charge of the illustrations and I can take it that you have nothing to do with the story, but how are you going to portray him in the adaptation? Are you going to make him true to his personalty of being an arrogant asshole or are you going to make him a peace loving, heroic type of character?