Filling an entire sketchbook within 2 months? Whoa, that shows some intense dedication and a very aggressive pace! (by contrast it took me about 14 months to fill my previous ~60 page letter-size sketchbook, even when using it for writing....)
There are definitely signs of improvement in these comparisons - not only in terms of aesthetics and form, but I particularly notice that the newer drawing express slightly more dynamism (mostly via postures and expressions). That's definitely progressing nicely.
I might be taking a cautious angle here (that, and 4am logic is speaking on my behalf :colonveeplusalpha:), but I would definitely encourage finding a moderate pace to continue improvements - doing too much at once can easily lead to burnout as well as a growing gap between perceived and actual skill (which tends to result in frustration and all the related stuff). Of course, cram sessions on specific topics are definitely handy in their own right, but for the most part slow and steady methods are far more preferable.