Hellooo! So, I’m not going to go super into detail about it, but it’s basically about using blocks of shapes, clipping layers, and looooots of layers. It’s handy to separate the pieces into their own folders so you don’t get confused.
So first off, you want to start with a basic sketch. Make sure you reference so you can get the lighting and proportions correct.
So once you have your basic sketch, you can start filling in the blobs of colour.
Then you use a med-dark shade of gray with air brush tool and set it to shade at 100%
Then make a new layer and use white airbrush to do your highlighting. Set it to screen at 79% opacity.
Then you add your textures and mess with the brightness and contrast to deepen the colour and the like. And then you have your finished product!