I don't really wanna tell you exactly what to do. It's better if you get an intuitive reason for why.
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Closest arm back-[up or down]. Furthest arm forward-[up, down, or same height, doesn't matter as long as it looks like extension]. Upper body (including hips) forward atleast one more pixel on punch extension. Notice that these are very small subtle edits.
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Closest arm back-[up or down]. Furthest arm forward-[up, down, or same height, doesn't matter as long as it looks like extension]. Upper body (including hips) forward atleast one more pixel on punch extension. Notice that these are very small subtle edits.