The 1st and the 2nd image have just a bit of a lack of contrast with the colours. The red could be a bit brighter in the first image, and the darker white could be a bit more darker in the 2nd image.

3rd image: add some grey on the bottom of the clouds for more volume. And use the dark brown earth colour to do the same to the bottom of the land islands but with a rougher transition to give the earth a rough texture compared to the smooth colour transition of the cloud.

Hope I helped somehow.

is good, is not important how looks now, is important u start do something, no matter if looks professional or not. good job

A pixel art bird... hmm, it's kind of tough because pixel art birds are generally so small anyway so I'd say it looks good but if you want to add more details, you'd have to bump up the resolution to 32 maybe. Also this is a style choice but the egg lighting looks flat, maybe you should shade it.