OMG. Your crack me up. Obviously I haven't been around in a while because I just saw this post. Didn't know you were the pimpin type! It's all good. It's good to know these things about your friends. lol.  I"m excited to hear how the show is going. Is it on?

I think Eileen Morey has a lot of good advice. If you are picking and choosing. Pick the ones that serve the audience at large.  All of your work is excellent. Pick the most general subjects. The rest will follow.

I love your turtles too.
Jen

In terms of marketability to a broad audience, I'd say anything except the clearly medical/biological stuff.  I think that you'll make a splash with your images related to dogs, cats and horses, but the fish picture is also a winner.

Whatever you put into the show is likely to earn you a label, as in, "Oh, her art is about _____."  So, choose a work (or works) that provide a cohesive presentation... and are subjects that you won't mind working with over & over & over again.  Seriously.  Anyone who thinks you could create a great portrait of their horse/dog/cat/fish... they'll be on your doorstep, ready to hire you. 

Pet lovers (and I'm one of them) are often worse than parents (I'm also a parent) when it comes to portraits.  Maybe it's because they know that there dog will be around for maybe 12 or 15 years, max, and they'll want a memento.  All I know is that the pet portrait market can take over your life.

Just don't ask me about the guy who owned a cheese factory and wanted me to paint each of his favorite cheeses in still life groups, for his office walls... *chortle*