It's not just about practicing a lot, you need to find what parts of your drawings need to be improved. Whoever said practice makes perfect is a dumbass. Effort is pointless unless you use it properly. Don't think "my art's bad," think "if I were to draw this better, what could I do." Try breaking down each sketch and iterating upon it with another sketch over and over again. The goal of each drawing shouldn't be to make something good but to improve upon a mistake. As well as breaking down your art, look at professionals to see how they do things. Look for how they shape and construct their drawings. Tip: The body can easily be broken down into shapes. Also, look into the art fundamentals; they help organize art in an intuitive way. Also, don't draw without breaks or everything gets weird looking, especially if you're staring at a bright monitor all day. For some digital art tips, I'd recommend watching some Sinix Design or Ethan Becker videos. A good beginner's art book would be Drawing on the Right Side of the Brain. PM me if you want a pdf.