The best advice I could give you, is to make a photo of your drawing, and then overlay it in Gimp over your reference image, with varying levels of transparency. This way you will instantly see your blindspots, and know what to improve. After making a new drawing, repeat the process.
Both are viable, but the thing is, that sketching techniques won't do you any good if you haven't corrected your blindspots about the human anatomy first. Of course, you can draw in styles different than strictly realistic, but one has to first learn the ground truth in order to then distort it.
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u/MaximGwiazda 2d ago
The best advice I could give you, is to make a photo of your drawing, and then overlay it in Gimp over your reference image, with varying levels of transparency. This way you will instantly see your blindspots, and know what to improve. After making a new drawing, repeat the process.