I think your metals look fantastic. Great blending, good contrast. Your leathers and the tartan look good. They're not spectacular, but if they were the "worst" part of your model, I think you'd be ok to let them lay. Your flesh, however, is falling flat.
Part of the reason I think is that it looks too chalky. Possibly a combination of the color you used for your highlight, and blending that makes it look more like drybrushing.
The other thing I think that's not working is the inconsistency of the light source on the flesh. It's fine in some places but others it's either too subtle, or not pushing the concept of where the light source is. Look at the pectoral muscle, for example. The brightest part should really be towards the top with a gradual but obvious falloff towards shadow as it gets down, but really the brightest part is where your core shadow would be, more than halfway down. And the back muscles are almost uniformly lit in the light side.
That's my opinion on it anyways. Take it with a grain of salt.
