Yay I want to be friends with your ponysona!
I don't know much about design, but she looks delightful, thoughtful and cheerful!
And i like the colours.
Also down to earth. Looks so stable.
Hope I'll make a ponysona one day too.
Also I agree with @LumenNightlight maybe choose a cutie mark that has a deeper connection with your character. It would be interesting to learn more about you. ^^
And again, lovely ponysona!!