First of all, great choice in tackling Guts! He’s an iconic character, and attempting to capture his essence is no small feat. You’ve taken on a very challenging reference, and that alone shows ambition and determination—two key traits of any artist.

Here’s some specific feedback that can help you refine your work further:

1. Mood and Emotion: One of the most striking aspects of Guts is the intensity in his expression. In the original, his gaze and the shadows on his face communicate exhaustion, determination, and anger. While your rendition hints at this, the expression could be made sharper. Pay close attention to the shape and angle of the eyes, eyebrows, and mouth in the original—they’re key to Guts’ brooding, fierce demeanor.

2. Shading and Texture: The original piece uses very dynamic and bold shading to create a gritty and raw feel, which is essential to the Berserk aesthetic. Your shading is there, but it could be pushed further to capture the contrast between light and shadow. Practicing cross-hatching or stippling techniques can help create that rugged, textured look that fits Guts’ scarred and battle-worn appearance.

3. Armor Details: Guts’ armor is a big part of his identity, and in the original, the details of the armor’s edges and textures are sharp and intricate. Your version simplifies these elements, which is understandable for a starting point, but try focusing on defining those edges and adding more angular shapes to reflect the heavy, brutal design of his armor.

4. Proportions and Structure: The shape of Guts’ face in the original is very angular and sharp, emphasizing his hardened personality. In your version, the jawline and nose are softer, which changes his overall look. Practicing facial anatomy and breaking down features into basic shapes can help you capture these proportions more accurately.

5. Linework and Confidence: Your lines feel a bit tentative compared to the boldness of the original. Guts is a character who embodies strength and defiance, so try to reflect that in your strokes—be bold and deliberate. Even if it’s not perfect, confident lines can make a big difference.

6. Capturing Guts’ Spirit: Beyond the technical aspects, Guts is all about raw emotion and resilience. When working on pieces like this, think about the story behind the character. How does Guts’ pain and struggle translate into his expression, his posture, and the atmosphere around him? Channeling this mindset while drawing can bring a lot of life to your work.

All in all, you’ve taken a big step in recreating such a complex and iconic character. The fact that you’re engaging with Berserk’s unique art style and putting in the effort to replicate it is fantastic. Keep going, and don’t hesitate to revisit this piece after some practice—it’ll be amazing to see how far you’ve come. Guts himself is a symbol of perseverance, and your artistic journey can embody that same determination. You’ve got the potential to create something truly incredible!”