This doesn’t look bad at all. But, the fact you have to ask that makes me wonder. Anyone who has developed an understanding of letter structure to this point wouldn’t question if they are or not. Also anybody who has developed this far must have quite a bit of actual painting experience behind them because to get to this level of letter form I’d be safe to assume it took quite a few years of development and a lot of practice. So the fact you’re asking makes me wonder if this is 100% your work or not.