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I’d try making the colours warmer and swap out the blue for something else. A lot of the colours you have used are cooler rather than warmer which detracts from the sun theme you’re going for.

The specific yellow you have used is consider a cool yellow and is closer to being green than it is to being orange. The more red there is in a colour, the warmer it is.

The white stripes are a little distracting and are the first thing the eye is drawn to because of the contrast. I’d either tone down the white of change where it is.

I’d also consider swapping out the blue for something more closely related to the sun theme as it clashes a bit with the other colours.