I'm with Ernest, these show good observation and proportions, so we can move the bar up for you a bit, because you're going to be good at this

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I'll try without the lines but it's an old habit.
Which is why its all the more important to break it, Aaron

Try to work entirely by shading - shade
across the form rather than
along it - in other words, every time you
think you see a line, shade at 90? to it instead. (it helps to try drawing something big, to get the feel for this)
Try to think of things in terms of them being areas of a given degree of lightness or darkness (these are called brightness
values )- and that the borders of those areas are generally
steps up or down in value (or sometimes in colour) rather than lines.
Lines result from our tendency to equate what we see by eye with what we feel by touch - they are a symbolic representation of the
feeling of touching an edge, trying to find the closed edge round something. What we
see are generally areas of different brightness adjacent to each other.
Dave