Looks like a good start. Nice finish on the horn, and it doesn't look like you went too fat with it. Using blanks is a great way to get a feel for the hobby using mostly tools you likely have on hand. Horn is sometimes a pain to work with but looks like you did a nice job with it here.
I agree with the above that the pins are a bit big. Keep in mind that you can always go with a smaller pin than the hole size. The epoxy will fill in the void. A lot of guys intentionally oversize their pin holes by a decent margin.
As far as the spacing. Since it was a blank, you were kinda screwed, but maybe just using the front and back holes would have given you a more favorable spacing? (I'm guessing the blank is Pakistani? Indian? They crank out a lot of pattern welded steel there but I don't think anyone owns a tape measure...) A hidden pin could be used in the center, or make a pocket a little larger than hole sized in the back of the scales on either side. If you make the pocket so that it has a larger interior than opening you create a good mechanical anchor once the epoxy cures.
For your next one, concentrate on the best quality steel you can find. If it is a blank, find one from a reputable maker or supplier. The Pakistani stuff looks OK, but most of it is poor quality steel. (Not your wife's fault, no way to know...) The steel is the heart and soul of the knife after all. Take away all the other components, and the blade alone will still be able to perform its intended function. Jantz, Texas Knifemaker, USA Knifemaker, etc all have a lot of really good offerings.
If you are considering a deeper dive into knife making, let me know. I am sure I have some extra materials around here that I can send you. I may even have a blank or two...
-Eric