Hey Henrique, beginner here as well, I'll tell you what I can spot: Yes cast shadow is a bit too short and perhaps the darkest shadow of the pear is a bit narrow, or too light? Keep up the good work!

Well done! Your shadows are pretty spot on. Maybe not necessary to as many lights in the hair as you did. But definitely impressed by how you did the lips. Really great.

I'm only going to comment on the pear since I'm a beginner. I think you did a great job with simplification and area distinguishing on the pear.

Decided to do a fourth one for fun and see how a paint brush vs pencil would look doing this exercise :)

Looks great! There is good improvement and self-correction between each step :) In the graphite one, the midtones do start to get a bit blurred together, so if you decide to return to traditional, it's something to keep an eye out for. In the second one, the shapes get a bit complex, but by the final pear, it's definitely on the right track. Overall good work!

Nice work :) I might just suggest bringing in the highlight seen at around the middle of the pear, where the pear's bottom curve starts. This can help bring in some more dimension and description to the pear's shape. I would also recommend removing the outline between group shapes, as this border can break up a bit of the 3D illusion.

There's a good illusion of three-dimensionality. I think you can further push this by bringing in a clear scale of 5 values, as right now I can only really see 3 distinct value steps. It seems like the reference has more values in the shadow than the light (though it may be in part due to the camera, so cross reference with your first-hand observation) so a good breakup would be two values for the light--one for the main area of light and another for the brightest highlight--and three for the shadow side. You're definitely on the right track though, so you got this!

The improvement from the first to the other two is really impressive! One thing I'd still try to work on is avoiding the outlines. They are still visible on the lighter parts of the pear in the 3rd drawing.

I like the way the pear looks. It does seem a bit flat (as opposed to rouneded), but it clearly is standing on a plane and has shadow. As for the shades - the dark shadow and light shadow seem clearly separated to me. But then the dark half-tone is almost the same value as the light-shadow. I'd work on separating those. Maybe draw the values you're aiming for side-by-side on the page, as squares, to see the gradation and work on that a bit? I'd also try doing without the outlines, as they create false separation between values. One last thing - I don't know if it's the picture or the page, but the page looks kinda dark. If it's not white paper, I highly recommend drawing on white. I tried drawing on toned paper, and it's so much harder to get the values right!