When viewing someone's "first studio shoot" I am always torn between "encouraging" them...and telling them what might be avoided next time.
I would like to help you if I can.
But...my help is something you might not expect.
My Simple Suggestion: In addition to posting your photo, post what YOU think are the strengths and weaknesses of the image as it is shown.
In addition, post what you consider the "challenge" was and if there are areas where you wish you had more "knowledge" on some specific technical aspect of the "studio shoot."
IF you do this, it will allow others to gauge how they might be able to best help you with comments, observations, or tips.
Otherwise, you are likely to get either superficial remarks or criticisms.
I hope these suggestions help you.
Want something more specific don't you?
Here is a very quick observation: There is an odd shape below her breast. One could think it is a knee, or a bit of jeans. Or one could just see it as a distracting shape/tone.
there is a bright spot on the hair. That's an indication you overdid the lighting in that area. Your 40d has a function that will "flash" the overblown highlights of a shot. Chimp (look at your shots after taking them) and notice the blown highlights. Then adjust.
Good first attempt. I think for studio work it always looks better when the people in the photos dress up more. What your model is wearing is sort of plain and it would work better in a studio setting if she was wearing something more exciting or at least less casual.
Thanks everyone, it's an honor to be critiqued by the best in the industry. Following Steady's advice, I like the lighting on this but am not liking the blown highlights on the hair and the wrinkled shirt. I would have liked her to have arched her back more. I'll fix the knee in the background and the gray corners. The only adjustment I did was making the blue background white.