A) Ranging from waist and up to whole body, Price isn't affected by this. However price is affected by your choice of progress. That means sketched, linearted, colored or shaded pictures have different price ranges. A background costs more if there is any detail to it, but the price depends on how much work that detail requires. Extra characters also cost more, with price varying according to how much of the extra character is in display. Examples: https://inkbunny.net/submissionview.php?id=1230784 https://inkbunny.net/submissionview.php?id=1227627 https://inkbunny.net/submissionview.php?id=1223074
Regardless of which of the two styles you pick the payment process is the same. After the sketch stage is done and approved I await the payment before moving on to the lineart.
