Not bad for a first time bro!
You'll save yourself a shitload of mudding and sanding if you get those seams some more screws and as flat as possible. And yeah, remove the end paper.
Don't use lightweight mud for the first seaming coat. It can bubble your tape. Use a light undercoat, then install your tape and press in with your 6" knife. Then apply the overcoat thick with your 6", and flatten with a 12" knife, putting pressure on the outside edge (so that you are pushing the lines towards the middle of the tape). Then hit the center again with your 12" with light pressure to create a flat seam with few edge lines.
Once that is dry, sand down high spots and ridges. Then, do a second coat that floats out from the center to the edges to avoid the seam looking higher than the board (especially true on the deck, where the lights really cast shadows). Sand and smooth again after dry. Finally, apply the third coat with lightweight mud and feather it out to close imperfections and remove lines. This final coat shouldonly need very minimal sanding.
Hint:
You have lots of furniture in there, so I recommend sanding "wet." Take a 5-gallon bucket of water and lots of rags. Soak the rags and then ring them out real good, and then use those to "sand." Viola, no dust! Takes a little longer and you have to go slow to avoid making patterns in the mud, but the lack of mess is worth it. Once that dust starts getting everywhere, it'll be next to impossible to get out of things. If you don't wet sand with rags and sponges, move all furniture and WEAR MASKS AND EYE PROTECTION!
Good job bro! If you need any advice or anything, PM me and I'll give you my phone number.