I'm no Artist but I believe the proportions of the Jeremy's head is too "low" around the top, It makes it look really flat IMO.
Sorry if you weren't expecting any crits, Otherwise your shading's quite neat, Good job!
Oh no, I appreciate the criticism! I didn't even notice until you pointed that out so thank you because I totally agree. Sometimes I tend to blow through ny sketches that I don't realize my mistakes and never look twice at them.