Need piping practice

Made two batches of cupcakes, One orange flavour and the other lemon. Thought of going fruity this time.
Also made up two batches of butter cream. But looks like the topping of cream was too thick.
This is what I was told from people trying it out.
I piped the cream but through inexperience I am not familiar with different nozzles types and the cupcakes looked terrible. I thought the flavour was nice. With the lemon cream giving a acidy taste.
Must keep practising. I have few ideas to reduce the cream and still have the cupcake look nice. My mind is thinking towards flowers.
Will wait and see. Got my next class tomorrow night and funny enough the class will involve piping flowers..haha.