This is one of my favourite flies, and yours is a really nicely tied example. The only comment I'd make - and it's no criticism of your tying - is that I have found that, particularly in larger sizes, the long wing can be inclined to get caught round the hook. I hate it when you reel in at the end of a pool to find that the wing is tucked under one leg of the double and you realise that the fly hasn't been swimming straight for heaven knows how long .
So for the past couple of years I've been tying my Glenfarclases flamethrower-style. I use a second orange hackle to support the wing, and tie them in a little further forward than you might otherwise do for a flamethrower (so that there's about 2/3 or even 3/4 of the body behind and only 1/3 or 1/4 in front). Having two hackles instead of one means that you need to go a bit easy on the number of turns to keep the overall colour balance right, but otherwise at a casual glance you'd hardly notice that they weren't tied in the conventional style. I do think that, with long winged patterns like this, moving the tying-in point a bit further back on the shank helps prevent it wrapping round the hook.