Because the bugle faces the wrong way I would have to believe the image is reversed. Also the belt across the chest was for the cartridge belt and these belts were worn on the right hip.
During this time frame Detroit would have had a total of no less than 18 Michigan Uniformed Militia or independent militia companies. Based on the available uniform information I can eliminate 13 of the 18 companies. Of the remaining 5 companies not enough uniform information is available to decide which one he could be in.
The National Dragoons of Detroit, he wears infantry insignia, but the cap cords could indicate dragoons.
The Shield Guards were and Irish company, but may have had a few non Irish members.
The Lafayette Guard ca 1847-1850 I have almost no uniform information on them.
The Scott Guard, they were considered a German company but probably had some non German members.
There were a couple of juvenile companies, some for 14 to 18 year old, but a one of 14 to 20 year old and he could possible be one of these.
The 'open bugle horn" infantry badge worn 1832-1851, this one faces the right way.