For Easter, Colour Collective had 'Jonquil Yellow' as its prompt. Originally I was going to go with a lamb, garlanded with flowers, and I'd got most of the way through the linework when I suddenly changed my mind and decided to go with something more Australian (not that sheep are not Australian, but they're not actually native!)
Here in Australia we have the Easter Bilby. A bilby is a rabbit-eared bandicoot, a super-cute burrowing marsupial, so an apt animal for Easter. We still have the Easter Bunny, of course, and we still have chocolate rabbits - but there are also chocolate bilbies, which help to raise awareness - the bilby is critically endangered and needs all the help it can get.
Bilbies are not noted for their jonquil yellow fur, but they do like to burrow near acacia shrubs - which handily have yellow flowers - and I added in some yellow Easter eggs as well. Our little bilby here is doing his best to distract you from them, it's not Easter Sunday yet!
Here's the partially-completed lamb linework:
Adobe Photoshop CC2017 on a Wacom Cintiq Companion 2. About 2.5 to 3 hours, I think. I was watching tv at the same time. ^.~