Hi Enastasia!
I love your cat! Very cute! In your first design the blues are very nice but I think the gradient fading to a black deters from the color scheme! I would try maybe using a darker or more purple blue instead whether in a gradient or not! It would help make certain things pop more! But I wouldn’t use too saturated of a color as to not take away from the brightness of your light blue! I also really love your second design it’s very clean and very nice to look at!
Have a good evening!