I just recreated a tutorial I saw a long time ago. If anyone happens upon please feel free to add it.
I’ve gotten into a habit of emphasizing my knees more cause I just like the way it looks but you can always go with a less pronounced “knee bump”.
I should also note that this diagram works better for more feminine characters as masculine characters tend to be a tad more angular. Although don’t feel like you have to always abide by that as it is not a hard set rule. At the end of the day art is subjective and you are free to create characters as you wish.
While this reference can be a starting point for drawing thicker or more muscular characters I would recommend other references for those body types. Thicker characters can end up curvier and have rolls and such to take into account when drawing them, and muscular characters have more subtle lines to show definition.
I would also suggest looking up anatomy diagrams to study the leg muscles and bones. This helps you understand why legs curve and bend the way they do.
If you happen to be having trouble with proportioning the legs keep this in mind as you measure it out:
legs are typically the same height as the torso and head combined unless you are going for a particular style
the thigh is longer than the calf, I usually draw it out as being from the bottom of the foot to the knee when compared side by side
when bent completely back the heel of the foot just about touches the bottom of the butt (the under butt if you will)
