Great first bargello!!
I agree, a smidge more contrast between the three light colors would have been good. I also might have swapped the placing of one of the fabrics ... from the upper left corner - the third fabric down which is a pinky-purple I would have moved it down one fabric (so it is between the light purple with dark purple small flower and the mottled pink/purple).
There are two phases to choosing the placements of color ... value and color.