I love this card too, it is so different from the usual image of a apprentice and yet this is what is behind the apprentice... in a sense. The preparations to begin the apprenticeship of a knight. Ok, he's done the apprenticeship as a squire and is ready to take that next step of knight in training... sort of like graduation and entering the "real" world. So this would be a very special time, especially if he is of noble birth but has no fortune to go with it. This was how young men with no other prospects made their fortunes and being accepted into Arthur's court would be high honor indeed.
I like the red of her dress, the heart, the desire, the motivation out of love and desire for a better life for her son. Her hair is unbound and unadorned to show the purity and simplicity of her thoughts and action she takes.
The sun's rays are like a blessing, enlightenment to see how to do this in the best way possible and create the focal point of where to direct one's actions and endeavors.
She is still, calm and patient, working on this one stitch at a time, not taking shortcuts or rushing, using great care to avoid making mistakes because she is aware of the value of this undertaking and the material she uses to create something far greater than the original piece of cloth. You can have a chest full of wonderful things stored away, but until you make something of them, they are just stuff stored and not available, potential unrealized.
She is protected and surrounded by solidity and stability... something that withstands onslaughts and the changes of the seasons, that will stand for a long, long time. It's family, home, security and represents the past foundations that will endure into the future... a place called home. So I would think that it could represent that feeling of being at home with what you do and what you make of it, that it is something you can use for the unseeable future... something that will serve you well far into that future.