Hi, you export photos through iTunes (unless you were to use Mac and iCloud photo storage from Apple). You simply tell iTunes which folder to sync with the iPad, and it syncs all photos in that folder and subfolders, organised by folder names (at least the first layer of subfolders,probably). That means folder names in your photo folder becomes album names on the iPad.
Second, iTunes resaves and scales the photos it transfers to iPad, if they are bigger, to 2304 x 1536 pixels and some arbitrary jpeg compression level. Given that iPad screen res is 1024x768, should be still enough for some zoom to details.
How PM comes into this - simply. As I use it for all my organising, I have a Save As snaphshot in PM called Save to iDevice, which simply scales the photos to some size and smaller filesize (because I do not need 10MB jpegs in my iTunes photo sync folder), and saves them to that iTunes sync folder. Next time I connect the iPad to my computer, it syncs all photos inside that folder to the iPad.
That's the Apple's way, using only their own apps and the photos end up on the iPad inside its native Photo library.
However, there are also ways using other apps, downloaded from apple's appstore. I am sure there are some that allow you to copy photos from your computer to iPad at even bigger sizes, either though wi-fi, or perhaps their companion PC app and wi-fi, or their own iTunes interface (iTunes, when you have an app installed on the iPad which can accept files, allows you to copy files to that app only - for example many eBook and productivity apps allow you to import PDFs directly to them that way). However, I find that a bit cumbersome - because the photos are then stored and visible only in that single app. I do not mind the resolution restriction of the iTunes sync (2304 x 1536px) any problem.
Mind you, I am on a Mac, but all this should apply to PC iTunes as well.
Feel free to ask more if you need. Frantisek