This is really wonderful! Your style is great, and I like the shading you did. His hair is fantastic, and I like how it's especially messy in the front; it looks like he just ran his hand through it XD His grin is also perfectly drool worthy.
I must admit I'm rather fond of Grimmjow. He's in many ways, Ichigo's rival: They share similar personality traits, and are extremely powerful fighters in their own right.
Moreover, the symbolism between them can't be denied.
Ichigo was a Shinigami with Hollow Powers. Grimmjow is a Hollow with a Zanpakto and Shinigami powers.
All I can say for certain is that Grimmjow is still alive. He survived his fight with Ichigo and his injuries from Nnoitra, and he is going to make a comeback. I know this because of Shonen Jump. However, I do not know if he's going to be an enemy or possibly an unexpected ally against the Vandenreich.