Here Be Dragons which is a gallery full of original artwork dragons from kid's cartoon books. That's nice, especially if you are up-to-date with the latest dragons which are trending in children's literature. I may be over-empathising with my 6-year-old self but I can't imagine many children having the patience to look at loads of pictures of dragons without looking for a bench on which to sack-out-exhausted. I reckon you-the-adult have to give the weans some structure. Me, I'd concentrate on the evolution of dragons, some of which are far more credible than others. All the descriptions suggest that they are some sort of reptile and all land-dwelling vertebrates are tetrapods. Even if, as adults they have lost some of those four limbs. Thus for me dragons with four legs AND a pair of wings are a) unlikely and b) almost certainly descended from a common ancestor. If you were hot-housing your kid to be Director of The Museum of Comparative Zoology in Harvard, you could help them design a check-list of attributes and use these data to construct a phylogenetic tree of relationships among Gruffalo, Smaug, and Haku.
Another brilliant idea was to mobilise a day's worth of kids and their Dads in the Lego Dragon community art-push. Anyone younger than me is familiar with Lego: I was part of the first generation of Lego-builders when the little plastic bricks came to the UK in 1960ish. There were red bricks and white bricks. The Lego Dragon project was create a paint-by-numbers, highly pixellated, picture of a dragon out of buckets of 1x1 lego bricks in 32 different colours. The whole picture was broken up into 16x16 blocks which were distributed to punters along with a map of that section specifying which colour went where. Your task should you choose to accept it was to fill a base-tile with the coloured bricks according to this recipe and turn that in to Dragon Central. Each completed tile was then stuck in the appropriate on the wall. There wasn't room for a third pair of hands tricking about with minute Lego-bricks so I set myself the task of of picking up, colour-sorting and returning to base bricks from the floor and abandonned on tables round the room.
Well it turns out that making Lego-mosaic pictures is A Thing. Like all Lego stuff it is expensive.
Verdict: good idea, please copy for
other art-work; not necessarily dragons.