I like the brush technique in these top 2 paintings. They are very clean and crisp and each brush stroke has style. The colors are not too stimulating though, just basic primaries and secondaries.
The colors in the Flintstones ones are positively garish, even though the brush technique is good.
These colors are more subtle, although probably a bit dulled from the scans.
All these paintings are expertly done and very cartoony and fun.