Luke's been really brave, he's going through a lot and keeps on fighting with a strength and determination well beyond his years. It's wonderful that he and his brother were so quick to think of others and they've already managed to raise and distribute $2000 towards leukemia research.
If you'd like to help them you can buy digital artwork for a small fee via their Monkeybars page. All the money goes to charity.
The lemon artwork is currently available to buy.
You can purchase it here: https://www.monkeybars.net/society/thing/1671?sid=61#.TwIPP0ax3lA.facebook
Or check out Luke's Lemons for more art: http://lukeslemons.org/
The sea turtle painting will be realeased at a later date.