My project in Watercolor Illustration with Japanese Influence course

Here is my first attempt at watercolour after taking this class... I had the greatest trouble getting the scanner to pick up all my subtle washes :/. There is supposed to be a subtle blue in the window, the curtains are a soft green and the white smock has shading that disappeared completely in the scan.

I have NO confidence when it comes to colours. I used four colours (Gamboge Yellow, Rose Madder, French Ultramarine, Permanent Mauve) and a touch of Cadmium Yellow to help the socks and vest stand out. I found it really hard to figure out which colour to put where and how intense it should be. I'm thinking the background and props are very, very soft, but I didn't dare to heighten them for fear that they would overpower the character and everything would have the same tone.

Constructive feedback? :)