Show a certain amount of the subblogs on the main blog

hi is there way to show more of the subblog posts on the main blog, showing the the show of the subblogs on the main blog doesn't allow you to show many post on the main blog, because they are very long, putting something into the intro, is too short though and you can't put in images etc so it will make the main blog very bland.

a setting to show 50 and one picture of the subblog on the main blog would be good for example.