That looks good - it looks nice and neat and tidy from the piccies and I like the deep mahogany colour. I can say from personal experience that you learn an awful lot on your first couple of belts, and make mistakes that you won't make again.
Al Stohlman's 'Belts Galore' has a lot of technical detail on how to make a belt, though the majority of the book is dedicated to tooled belt patterns. His The Art of Hand Sewing Leather also has some useful tips on sewing in the belt loops.
I dyed the inside of my first belt, but don't do so any more (though I give it some treatment), because of the dye rub-off. Also, an undyed inside makes it very obvious that it is hand made (and it isn't visible in any case).
The worst bit I find about doing belts is hand burnishing the edges, as there's so much edge to do. I must see about getting by wooden burnishing wheel mounted on an electric drill.
Keep up the good work.
Geoff