I agree with everything @Martha Muniz had to say about values, edges and shadows, she is right on the button and her suggestions will improve your painting. What I wanted to focus on is your character drawing. Character design is difficult because everything about the character has to tell their story, this is why we have to think about everything we add. Here are a couple of things to think about: Not seeing his feet is odd. Are they stuck in the snow? That makes him look weak and immovable. His legs are bent in a strange way, making him look broken. His two belts look too symmetrical. His hair and cape are just laying there all limp and un dramatic. His clothing should have seams and different textures. There are some other drawing issues too so I did some sketches that I hope will help :)

Cool image! Great character, pose, and setting as whole. As you go further into illustration, I wrote some notes that will I hope you find helpful as principles to keep in mind: - Value clarity: If we think about it in black and white (and you can even add a desaturation filter in a digital program or take a B&W photo to better visualize), the image should still be readable, and the area of focus should be able to stand out, even when reduced to a small thumbnail size. Right now, the man is starting to blend into the background in terms of value, and while it's still a recognizable shape, pushing the value difference would improve the clarity and composition. In this scenario, I would personally recommend both darkening the outfit as a whole and lightening the background mountains. You can also prevent the light hair from getting lost by making sure the background value surrounding it is still darker than that bright white. - Simplification of values: Picking either the areas hit by light or the areas in darkness to focus in on details, while leaving the other more simple, is a method used to organize detail in a way that makes images less overwhelming and more visually clear/pleasing to viewer's eyes. Here, the image leans towards details in the light, so consider simplifying areas in darkness, like the face or hair in shadow. You can also simplify values for the sake of composition looking at the larger picture, so your subject/area of focus can have the most value range, while other less important areas are simplified. So here, this could apply to a large value range for the foreground, while the background mountains are closer to one value--which implies atmospheric perspective as well (meaning things that are further away are softer, hazier, and less detailed). - Soft vs hard edges: This is another way to organize your image and direct viewers' eyes. Less important things should take up less attention, which results in using lower contrast. Softer edges can both reduce contrast and balance out hard edges. So if you were to soften the background, it would make the man stand out more, and even give the impression of more depth and atmosphere. Also, for the feet, because of their strong contrast, both in value and edge, they currently take up a fair amount of focus. If they are to be covered in snow, breaking up the harsh edge with texture and build up from the snow piling up can be a way to both add clarity of the scenario and balance the composition. - Shadows: Make sure all the shadows feel consistent with each other. Based on the ground, there seems to be a strong light source coming in from the right, so there should also be strong shadows falling inside the shield and on the left side of his outfit. As you approach your next illustrations, the main thing I would recommend would be organizing the image towards a specific focal point, using the elements of art at your disposal, from value, edges, color, size, line, and so forth. Before diving in, something useful would be to make small sketches of your composition using only a few values, I would recommend 2 (black and white), to make sure your image is organized and clear in value and composition. As for whether it's portfolio worthy--If it fits with the type of work you want to be hired for and/or represents your current skills, then yes, I would recommend adding it to your portfolio. But even if not, it's always great practice and helps round out your skills. Either way, I hope this is useful to you, even just as principles to think about in future work. You have a cool style and I can't wait to see your future art. Best of luck! :)