I really wish you put in as much effort with the background as you did with Mike's face. And sure, the face is a giveaway but much of the rest of it screams to me, "fuck, I didn't bother with the rest."
I did smile a little bit over the thought of LV99 Mike being somehow morbidly obese. It's an alright idea, I'll grant you that.
You have an amazing eye for detail, like on his face and on his jacket (THAT IS VERY WELL DONE BTW <3), but everything else seems like nothing more than a rough sketch. The loincloth doesn't even look like cloth; it isn't shaded like cloth. And it also has the same shading as the rest of his body (especially the arms). This shouldn't be happening. Which is harder of a surface to you? Different shading gives different textures as you may already well know. Also, I cannot tell apart the fingers from the rest of the hands. It's strange because from a distance, all your other work looks far better defined than this.
And sure, I understand that you don't want to take away from the BG and you want to focus on the character. But that could've been done with lighting, and choice of colour, rather than the appalling shading at the background. A good way to tell apart if you've used contrast well is to turn the entire image into greyscale, and see if you can tell the difference between light and shadow in your piece.