Glad you're learning to roll...
Rolling a loaded kayak can be easier though slower as other folks have said. It can also be more difficult depending on weight distribution and the shape of the deck, which if it means that the kayak likes to be upside down can hinder a roll. Once had a bunch of rocks in my kayak (collecting) and the damn think was like an weeble toy. I could get to sculling but couldn't get it upright!
Water up the nose and burning eyes are unpleasant distractions. Nose plugs and swimming goggles make learning a lot easier.
No one has mention the kayak (or if they did I missed it) but whether you finish more upright looking down the paddle or laying out on the back deck is not only a function of flexibility, but of whether you have a lot of stuff hanging off the back of the PFD and, more importantly, whether you have a relative high back deck. Sometimes you can't lay back very well, but you can do a sweep roll with a more upright finish and be fine.
Free Standing Boat Racks
Kayak Motor Kit
PFD's (Life Jackets)
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