If you do decide to hold an exhibition there are quite a few places to consider. Venue Cymru, Oriel Colwyn, Conwy Civic and the libraries to name a few. It's a great way to get your work out there even if it is just a hobby....having an exhibition is fun
Sort a decent selection of your work - maybe stick to a theme ie 'Derelict Buildings Of North Wales' or some such title, get prints, greetings cards and business cards printed out, have an open night with the obligatory wine and nibbles...invite all your friends and family, tell the local papers even.... and Bobs yer uncle!
Just a thought like........ Z**