Very impressive drawing and shows a lot of talent. You definetely need to keep this up! I was very impressed with such wonderful detail and how neat and precise it all was.
One thing that caught my eye is that I think you have Thea's legs crossed while she is sitting down. That was a very good touch I think and one that I haven't noticed all that much in other drawings. Very nice bit of realism in my opinion. Her dress is so pretty and that's a very nice touch with the butterfly on the slicer. The bench and the sidewalk are done quite well. The fountain is another good addition to the drawing.
Most of all, I think you achieved in the drawing of how you described your feelings of Thea above as being serene but also very capable in other matters.
Excellent!!!!