Russ,
Very quickly before I head out the door to start the week...
First of all, very nicely done so far. The clean, uncluttered web design you've chosen matches the character of your mom's drawings very well. If I had a quibble, I'd say that I don't care for the text color so much. As the page loaded, the text was black before picking up its eventual color, and it lead me to believe that a grayscale, or a more muted pastel shade would look very nice, but chalk that up to personal preference.
As for the drawings themselves, well, they're priceless treasures, and you all are doin' the right thing in your preservation work. The next step of sharing them with the rest of the world seems a no-brainer to me.
Again, well done.
Scott