Don't listen to this guy, he won't say anything constructive. He's beasting for e-fame.
The name is great, I really like the English version of the word "COLOURS".
I'd suggest getting better fitting t shirts try http://www.epacificsports.com/,
I really like the fit. The reason I say this, is because it's not really a graphic t shirt, so people will want a quality cut. The sleeves are kind of big.
Get an actual model, or someone who could pass for a model. Have the t shirts fitted on the model. Better photography.
Other than that. I see potential in this. I hope that this was helpful