Advices to improve my art

Hey guys, so i recently made this for a friend but there's something that I quite dont like about it, any help?

https://preview.redd.it/bbgyrmaw9w4g1.png?width=823&format=png&auto=webp&s=bf620c08ddd14e36512e65b759876e0a53260d3a

https://preview.redd.it/p15awk0u9w4g1.png?width=823&format=png&auto=webp&s=4b0d69dd7b363c41b3d4b9961ad9bbdd8174a3e1