Not a lot but I am up to 28 (with 2 ???) monsters on this list.
If you haven't seen the large monsters, are mostly online or missed it when you played them you can grab images of the monsters at this Miiverse link. I am trying to get all the large monsters if able. I may try to do one for the weapons as well... Not sure on that yet.
For those who may not know MHgen allows for posting of screens to the MiiVerse which can be saved as a post or to a personal image file (limited to 100 pictures though). It's a neat way to share screen captures with other and can be posted here on the forum using:
[ img] https://d3esbfg30x759i.cloudfront.net/ss/WVW69jhKSv8P64qxh2 [/ img] (no spaces)
Miiverse pictures can be viewed in 3D on the 3DS and as .MPO files on other 3D devices.