Looking once again at all the images, I would say that Photos 5,6,8,and 9 have pretty good main light placement, in relation to the subject. #8 is the least-flattering light placement of those four. Shot #5 is VERY good light placement in relation to the subject. Shooting with speedlight flashes in umbrellas or softboxes, whatever, means that the light's EXACT placement, and its EXACT, precise effect, is not visible to the photographer as he positions the subject, or adjust the light, or as he composes and frames the picture. It takes a pretty fair amount of experience to know where, exactly, the catchlights are, and where the shadows will fall, and what they will look like, when using speedlights as studio lighting. If you look at the above pictures, you can see, the light placement in relation to them is pretty good in those shots. Look for where the "nose shadow" falls on the face; you are trying for a "modified loop lighting" method I think. Also, take note of where the flash produces small catchlights in the eyes of the subject. The danger is usually in placing the main light too far off to the side, and too far "back". Usually around a 30 to 35 degree off-axis main light angle gives a pretty easy-to-work-with lighting pattern that 1) produces catchlights in both eyes in a number of poses, and 2) allows the subject some movement without CONSTANT need to re-position the lighting and 3) casts enough of a shadow, without being too much of a SIDE-LIGHT that creates really deep, strong shadows and which kills the catchlights.