Needs much work.
Your Riolu is quite disproportionate. A Riolu's torso is skinny and its hips are wide, you made his chest wide and his hip skinny. His arms are supposed to be long and thin, not wide. Riolu's legs don't bend like a human's, they are supposed to bend backwards, like a dog's legs. He also doesn't have a tuft of hair on his head, but I can let that slide.
Overall, if this is your first time drawing Riolu, it's okay, but it also looks like you didn't have a picture to refer to.