A dropped ceiling would not be my choice. I hate them except in commercial offices. None the less, as a limited DIYer, you did a respectable job, and it looks much better than your old ceiling. But you missed a great and important opportunity to insulate to r36 before you hung the ceiling, but the beauty is you can still do it. I don't know what climate zone you're in, but if it gets cold in winter, insulate. Insulation gives you the fastest return for your $ on lower heating and cooling bills.