It is refreshing to meet an indie dev that takes feedback/criticism in a good way and is able to be honest about improving themselves. Major kudos for that :)
I have at least 2 artists on my Discord server; one specializes in (3D) modeling/texturing but has some 2D skills and the other is exclusively a 2D artist. They would need paid work, but if you are interested then feel free to join up in my Discord server and ask them if you like.