To me - it looks a bit narrow for the horse. It also looks like you are "locked" in a little bit. If your horse doesn't have big movement, this shouldn't be too much of a problem, but there could be something better out there.
Anebel- thanks for your post. I'm thinking it's the angle and shadows of the photos as I don't think it's too narrow - and yeah I was thinking I might be locked it which is the purpose of the post but as was pointed out by other posts, I can post easily and I do need the security right now since I am an adv. Beginner and my horse has been 'dangerously running away with me' to quote my instructor.
Additionally, my horse's movement is freer in this saddle then the others I tried as well. There could be something better but this saddle is at least 95% there and it's already available to me.
This week I've made SOOOOO much progress on communicating and controlling the speed as which I'm asking my horse to trot (had a lesson a week ago to address the 'running away'). I think a lot of it can be attributed to my position in the saddle (not tipped forward) and possibly comfort of fit for my horse. I actually like riding this week for the first time since owning her (2 months now).
You 'can' sit too deep on a horse...absolutely, without a doubt. Does that have to do with the depth of the saddle seat...no.
I prefer a deep, soft seat myself. It's a personal preference and it also based on a number of other factors...unimportant for this conversation.
I agree that if you are 'locked' into the saddle such that you can't properly cue the horse, or you find you are constantly having to adjust your pelvis, thigh, pick a piece of anatomy, to remain in the correct position, then the saddle doesn't fit you and you need to keep looking.
So, try the saddle out...see how it feels and also make sure to have your instructor, or a good pair of eyes on the ground to make sure you aren't changing one bad habit for another positionally.
That seat looks deep but not too deep. I think it looks like a good amount of deepness if you know what I mean haha. The only way I would say a saddle was too deep was if it was too big for the person riding in it. This sounds like the saddle is very comfortable for you and you should continue to use it if it is working well for you.