This is a super cool idea and it is looking good, overall. I know this is a fantasy creature, but for the next round of improvements (if you’re going to continue refining), I’d study muscle anatomy a bit more closely. The character’s muscles look bulbous and misshapen, but not intentionally, as if it was the character’s design. Things to think about - is this character supposed to be menacing? Cute? Silly? Terrifying? Right now, the character doesn’t fall into any category - and this may be due to your current skill level. We’re all beginners and you’re doing a great job on this. I am hoping to help push you further by giving some constructive criticism. The claws on the feet look almost balloon-ish - they may be a bit large on the creature - how would the creature be able to properly walk on those?
Is this creature sinewy - all muscle and little fat? Or are there areas of the body that should have fat? Right now, the whole body, while large, isn’t well defined. Perhaps there are areas of the arms and legs that can be slimmed and sculpted while others are exaggerated and rounder to create a better sense of this creature’s strength and proportions?
I want to reiterate that you’re going a great job and I hope you continue working in Blender - whether on this creature or others in the future. Each character you do, you will find yourself improving immensely.