That looks great, it's really coming along. I suppose it could resemble the Great Ape a bit, but it'll look more like your 2d reference when you finish the hair. Something to be aware of though, at some point you'll need to split the lips apart and do the inside of the mouth. Don't forget he uses his teeth to attack. That's something for later on though when the body's mostly done and you're ready to do his accessories. One thing I did notice between Kaldarasha's drawing and your reference is the tail, granted you mentioned it was a deviant art entry you edited to resemble Red XIII. Are you planning to add the flame to his tail?
Thanks, Ash sculpted detail and used polypaint in zbrush after modeling a lowpoly mesh in Maya to get started. It's a powerful tool.