Welcome! Glad to have you! I'm definitely appreciating your husband's sense of decoration. The centerpiece is simple but elegant, in my opinion.
It's hard to see, but are your plants fake? If so, have you considered replacing some (or all) of them with live ones? They're excellent for tank cycling and look authentic too.
And for what it's worth, I started with a 10G as a newb, and made mistakes too. Didn't even know about cycling! I'm now into a 29G and my stocking options exploded. I think you'll appreciate the extra space, should you migrate to one.
As always, if you have any questions, there are plenty of people willing and eager to help. Welcome aboard!