Overweight older women with scraped back long hair tied in a pony tail, several tattoos, smoking, wearing cheap fashions/ footwear - sign of poverty.
For younger women, cheap fashions/ footwear, smoking, overweight/ obese.
Beer guts.
Hard facial expressions.
Tattoos are not a sign of poverty on their own.
Men - overweight, beer guts, wife beater shirts, consuming interest in cars, Nascar, WWF, combat 'sports' like mixed martial arts, machismo in general. Smoke, chew tobacco, weed before it was legal.
In Appalachia, skinny limbs and protruding bellies are a sign of poverty.
Neighborhoods - in the poorest, there's neglected housing (peeling paint, gutters in disrepair, unfashionable colours used for house exterior and trim, amateur repairs visible), litter, graffiti, chain link fences around front gardens, metal security bars across windows, metal bar security doors outside front doors, interiors cluttered, dogs chained up outside, too many pets inside, unkempt or minimally maintained gardens, paved-over gardens, fake turf, streets not maintained well, curbs crumbling, weeds poking through cracks in the sidewalk, broken glass on sidewalks, empty lots from the riots of the late 60s and subsequent decay. Lots of corner liquor / convenience stores. Children out with a parent and teens out on their own at all hours of the night, crowds gathered around liquor stores seemingly all night, or sitting out on stoops. Speed bumps everywhere. In rural areas, old fridges, ovens, sofas, junk cars all over the lot. House in need of repair.
Middling / somewhat struggling neighborhoods can look neat but you'll find more obvious consciousness of security than you'll see in affluent neighborhoods (signs declaring a neighborhood watch area, alarm systems very much in view) not much money spent on landscaping, and deferred maintenance to homes (maybe needing a paint job).
Attitudes - not many avid readers among the very poor, sometimes resistant to changing diet or exercise habits, beliefs around causes of diabetes and heart disease that indicate a serious lack of education in the area of nutrition and basic biology, seldom travel far from where they were born and raised.
Interiors - often very basic, cheap furniture, and maybe a bit shabby around the edges despite efforts to make homes look affluent in the form of very tailored curtains in the living room, fashionable knick knacks amd cheap, fashionable art. Usually very clean except in the case of dire poverty (look up videos of homes children are being removed from for examples of really bad living conditions that can go along with poverty/ substance abuse).