Hi, Xina, great start, IMHO. Pat and Robert have given you some suggestions, but for a first go with OP looks like a really good start for you, at least to me!
It is interesting you mention the "white flecks". Those become the focust of much debate among OP artists. Some, especially John Eliott in his book on OP, absolutely love them and, in fact, consider them to be one of the great things about OP, how it leave that "sparkle" of the support showing though.
Others just as adamantly despise them and want to cover each and every one of them with OP.
Same with the texture of some papers. Some people like the texture showing through and the effect it gives, others don't.
All a matter of personal taste and what appeals to you. I tend to like them and the "broken color" effect they contribute, but that's my personal opinion. In some pieces it might be they would detract. No absolutes around here, just plenty of generalities and always other viewpoints. That's what makes this so great. We get to look through lots of other peoples eyes and get a sense of how they see the same things we are looking at, but interpret them differently.
Glad you are excited about your art! Look forward to seeing more!
Bill
