Your first creation isn't awful. In fact it looks pretty good to me. Granted, I'm a beginning bowyer, but your tillering so far is pretty even and that's what's important.
Jawge's given me the advice of keeping the bend well away from the handle so I'd tell you to make a line 2-3 inches either side of yours and not remove wood within that area. That leaves less of the limb to bend but will keep you from losing your grip, literally.
It's the same when you get to the tips; leave 5-6 inches alone until you've got no other option. You still have from mid-limb out to tiller but go methodically... use a scraper rather than a rasp and keep the edges rounded over so you don't raise a splinter. I mark the area to be removed with a squiggly pencil line then scrape the marks off, then blend that newly scraped section into the sections around it with a couple of scrapes.
After the scraping I restring the bow and exercise it on the tillering stick, gradually working my string down to where it was, then to its new location, but not all the way down right off the bat. After 20-30 flexes at this new, longer, draw length you can put the string in a slot and recheck (gizmo/photo.)
I hope this wasn't stuff you already knew.
Before you finish the tillering you want to do your finish sanding (back & edges) and rounding over the grip. That way any changes brought about are absorbed into the tillering and not something with surprise consequences.
Keep up the good work.
Joel