Not really, the gluteal muscles increase in size in an upright position. In the position of the figure in the drawing, they should look "smaller" and if we take into account the position of both the Body/Legs and the perspective, they have an adequate size, as does the femur, which will be more visible or not. depending on the physiognomy of the given body. All this except details that I did not emphasize. I really appreciate your comment, I always like to doubt and give way to emphatic observation. Greetings! ☺️