Teh cake is a lie
Ok so this one here is ok here and not bad but a bit small. I know pixel art can be small due to the theme and size of it all, but I feel you could have added more to this in terms of size and maybe a setting. Maybe have people around the cake have their hands in the air or just animating the candles of the cake would have been a nice addition to this piece. I do like it tho and it is good for something new in your pixel artwork. I think keep it up, but maybe try the suggestions for the next one.
~~THINGS TO IMPROVE ON~~
Maybe add more characters to this or animate it next time you do a pixel piece