I was a law clerk on the Appeals Court so I know quite a bit about MA appeals (though not other states').
MM is entitled to one direct appeal of his conviction, in which he can challenge the sufficiency of the evidence, evidentiary rulings, and other trial errors. If he loses that one he can bring an unlimited number of motions for new trial (called collateral appeals), but if he tries to litigate issues not raised on direct appeal, they are very likely deemed waived. Collateral appeals are much less likely to be successful than direct appeals, but winning them is not unheard of depending on the issues raised.
Success on direct appeal depends a lot on whether trial counsel raised issues, so he is definitely in a better position than many criminal defendants, having been represented by a lawyer as good as Shapiro,
Sent from my iPhone using Tapatalk