Using either only tall pixels 1x2 or only wide pixels 2x1, you are challenged to draw a scene which focusses on one of these 4 dinosaurs:
Triceratops - Tyrannosaurus - Brontosaurus - Stegorsaurus
A wide or tall pixel scene means that all pixels take up double the amount of space, aligning to either grid below. You have to pick one, you can't mix the grids. For an example, have a look at this recent widepixel image from Christoballs.
Also the colors are very specific: Perfect black (#000000), perfect white (#FFFFFF) and any perfect grey of your choice, meaning that the red, green and blue component all have the same value (such as #A0A0A0 or (160, 160, 160))
Canvas size - 100x100 for the final image (so 100x50 widepx or 50x100 tallpx)
Colors - Exactly 3, black, white, and one gray of choice.
Transparency - No
Animation - Optional
This challenge was suggested by Stickman
The challenge thread will have all the challenge updates. The thread is also a great place to post your WIPs.