Those wooden pose dolls are bullshit. Buy posable real dolls off etsy for more realistic proportions + more body type options. (They're expensive, but worth it.)
Study old Renaissance paintings. Those bastards were floppy and twisty as hell. It'll help beat your brain with a stick when your poses get rigid. (Trust me. They will.)
If you have any sort of white spare clothing and a camera. Draw grids on the clothes in sharpie and wear them. Take photos of yourself in the pose you want. Self-reference + line/spacing guide. (You can use rubber surgical gloves + sharpie for hand reference, and if you have washable markers you can draw on your feet to get those gridded. Just wash after.)
Parchment/bakers paper on magazines, book covers, TV screens, anything. Cheap tracing paper.
There are tons of stock photo sites + anatomy sites.
A free site that lists websites by their use and specialties. A "Website Library" basically. They have royalty free stock photos, mockups, fonts, web design, UI development, an entire section for Free recourses, and 3D models.
It is under a bit of construction it looks like. So the other sister-site is Bluevertigo.com.ar but it's an Argentina based site so some text won't be English.
Basic size guide for just about anything. From a sheet of paper to Rocket Raccoon. They have everything. Celebrities, generic humans, animals, plants, objects, furniture, fixtures, buildings, layouts, transport equipment, sports equipment, digital scale shit like avatars and banners, and fictional characters.
AdorkaStock on Deviant Art
Good pose image gallery + divided into pose type categories But there isn't too much size/color diversity. There's skinny, lanky, average, chubby and bulky. Which is good but there aren't many extremes if that's what you're looking for. It represents men and women alike, of almost all body types.
A 3D medical approach to anatomy. Hard to navigate + pay wall, but overall good for body horror drawings or skeletal study.
Free to an extent. Tools are under paywall, only basic abilities, but still good range with Free.
Basic image collection site. If you don't know Pinterest, go check it out.
Timed drawing practice for any age/gender/clothed/nude human, any animal type + animal skeletal structures, any gender face + facial expression, any 'gender' hands/feet, Scenes + Environments (scenes and environments Under Paywall)
+ 360 view of gallery (3 models, 2 women (Rose: Ethnic woman slim body type - 7 photos) (Olga: White woman chubby body type - 6 photos) 1 man (Javani: Black man moderately muscular body type - 7 photos) all in underwear (not nude) all standing
+ blog posts and resources on anatomy learning
Paywall. Limited free use.
Reference.sketchdaily.net
Timed drawing practice- full body, body parts, animals, structures, vegetation.
Free as far as I can tell.
Other site links for resources, image gallery (441 photos overall on site)
Free as far as I can tell.
Visual Medical Body System Learning.
Mildly interactive, simple button photo scrolls. Condensed text for easy reading. Simple graphics, no fancy colors or textures.
Free as far as I can tell
200+ video anatomy guides (including NeuroAnatomy)
Very medical, very visual, video based + occasional 3D models
Free as far as I can tell
Blog on health+body including Telehealth, At-Home Health products and At-Home testing. Mostly vitamins, hearing aids, STD tests and DNA tests
Anatomy resources both visual and text
Very medical. Free as far as I can tell.
Anatomy lessons (medical based)
377 lessons divided by category (25 of which are 3D models)
App - "textbooks, 3D models, over 1700 quiz questions" Compatible with both IOS and Android (IPhone + Android: Google play and App store)
Free as far as I can tell
Poses, lighting features, lock feature, AR feature
Paywall + only IOS (IPhone/IPad) compatible