How To Draw An Owl: The Chapter.
P.S. Never understood why apple trees needs to be thinned... We have several apple trees in our garden, some of them are really old (about 40 years old at least), and we never thinned them, not even once. We just take care about water, whitening the bark with lime (to get rid of aphids and similar insects and prevent sunburns) and propping and cutting the branches. If there are excess flowers or fruits, they will fall off naturally, and I never noticed that it has any big influence on shape or size of the apples itself - the lone ones could be slightly bigger than the ones in groups, but it's not consistent - the weather and watering both have much bigger influence. It could be useful if you grow apples specifically for sale, but for me it looks like throwing out your own money.