The business is called 'Loot Turtle' and provides merchandise management for online brands. The 'loot' in this context is clothing and branded stuff, rather than gold or the proceeds from a crime.
Think comic con loot.
I like the idea of a videogame style of art, but dont have a preferred style, so 8 bit, cell shading or more realistic graphics could work. Just dont make it look like minecraft.
The design needs to have a turtle with some form of loot. So it could either be wearing it, finding it or carrying it on it's back, either strapped to the shell or in a chest on the shell. It could be handing it out to customers.
As long as both elements are there and it looks cool, thats the main thing.
The design will be screen printed, so please try to keep the number of colours down. You can use up to 7, but avoid shading and gradients.
The shirt will be dark coloured, so text should be light, or have a border to stand out.
The design should be approx half a shirt in size.