The vibe that I wanted to achieve on this design was cozy & easy-going look that would go well with beach vibe, welcoming and relaxing.
To support the cozy look, I avoided using sharp shapes and jagged lines in the design.
I chose pastel colour palette to create the cozy vibe. However, the cyan colour of the car wouldn't strong enough to attract the focus from the viewer if it was printed on white T-Shirt. So, to compensate with that, I incorporated brighter colour i.e yellow disguised as the sun that acted as background to add contrast to the composition.
I used bold lines with rounded edges to give the image cartoony feel and thus felt more friendly. Yet, I didn't want to over do it that would make the design too childish to be used by adult.
I also placed the car and the texts relatively at the centre of the sun to keep the composition visually balanced.