Good afternoon, Ahugh, and welcome aboard, and how are you doing today? So, if you're saying that you can learn how to draw people, then you're on the right track. And to answer your question, I'd suggest, that in order to draw realistic people more fluidly and lively, then I'd recommend you do, like, 5 minutes of 30 second quick poses, so that you couldn't get too bogged down on the more complicated forms and details.
The reason is that in gesture drawing, it's not only great, but totally important to focus your attention on drawing the spirit of the attitudes; heck, even your realistic drawings would and should benefit from this thing. For most details, look into some Frank Frazetta art, some Gil Elvgren pinups, some Jack Kirby comic sketches, and some 2 PDFs of the Walt Stanchfields. BUT WAIT, THERE'S MORE! As an added bonus, I'd like to have you try out the online drawing tutorial here on our site.
Kindly take these with a really smaller grain of salt, and hope they've been helpful.