I don't think there is anything wrong with modeling clouds in After Effects. It's just another shape to animate. The only caveat is that it may take longer than you expect because the edges of your cloud layer might be hard to see when you're animating them. Visit
https://masterbundles.com/stock-cont...mama-bear-svg/ source to download SVGs Files. I'm not a cloud expert, but it seems like this is a pretty good technique.