Character Design: Luca Mitchell

Few ideas of how Luca Mitchell, the young chef from the story, might look like. 

I don't know yet, if I want the style to be really cartoonish (though in order to design something cartoonish I need a non-cartoonish version in first place). 

Unfortunately, these designs are not convinving enough and I'm not happy with them. Next approach to Luca Mitchell is definitely needed, though I might work more with numbers: 4,5,7 as they seem the most appealing for me.