I'll offer a bit of critique.

The tiger's body is very nicely done. Good color, good sense of form, and well-lined. The sweat shines on the arms look a slight bit off though. They don't seem to follow the form of the arms, and instead just seem to fall in a straight line. Since the hands are human shaped to some degree, its good to keep in mind that the hand on the forehead would likely have the fingers curling somewhat inward. If he's just wiping sweat off the brow, the hand wouldn't likely be straight, it its more "rigid" position, but curled in their normal resting position. As for the face, the ears, shape, and mouth are done very well. I think the eyes may be spaced a little close together. Predators have a notorious feature of their eyes being in the front of their head instead of the side like a prey animal, but in general there would be more space in between where the bridge of the snout would come up to meet the forehead. The positioning of the excersize bike seems right, though it might pay to look around for a reference and give it a bit of a fine-tuning in its form and shading.

Hope this was helpful to you. You're doing great, just keep it up!

This was extremely helpful. Thank you. :D

No problem~ ^^