there's no way around it, figure drawing is one of the hardest types of drawing there is. I think you honestly have a lot of great stuff here! Great job doing a lot of these. I enjoy your line work. To your point of the drawings feeling lackluster, there is a point where Stan and Marshall talk about rhythm. Rhythm is an aspect of figure drawing that takes time to learn, but it is the connection point between two seemingly disconnected things. This can be a hidden connection such as anatomy (under the skin), a curve that is behind an arm or an obstruction. We must always be thinking about the form as a composition. Where can we see these connections and rhythms? If you don't know anatomy, just try to find beautiful lines within the body positioning. maybe the chin tilts towards the left thigh, draw a swooping C curve that connets the two and see what the result is! If you do know anatomy, use it to inform where certain points have a relationship! Gesture is the action of the pose, the weight, and feeling of a pose. It often looks best with confident mark-making and emotion rather than analytical and measured marks. Take a look at Force: dynamic life drawing by Michael Mattesi. Exaggerating the pose is helpful, even the most stiff poses typically have a lean or tilt somewhere, if you can see it, push it further to exemplify it on the page! The last thing I'll say about gesture is that it can't be accomplished with the stick figure style drawings that you are bending around. The linework MUST connect exterior with interior parts of the body and can not only stick to the center line or the contour. it is a careful combination of both! Keep it up!