I think it's really early for me to consider offering you critique. Two scenes is such a small number! I can offer the general advice from my personal experience: when I really like how someone RPs, I try to narrow down exactly what aspects of their RP I enjoy and try to incorporate them into my own RP. It sounds like some of your concerns are natural character-settling concerns. (Was this reaction weird, was this interaction okay.) I know that, when I have a new character, a large amount of personality gets solidified in my first couple weeks of play.
How I approach RP is a lot how I approach acting, and I think that RP is a lot similar to acting than it is to writing prose. (This might also just be because I'm an actor, so this is my point of reference.) The more I worry about how my poses are coming across, the more self-conscious I get, which is no fun. My best RP happens when I focus on reaction. (Which is, incidentally, one of the most important aspects of acting. POINT OF REFERENCE, OKAY?) Reading carefully what the other person has written, focusing on the genuine reaction of my own character to it. My worst and most frustrating RP happens when I let myself stop focusing on that and focus on what I'd
like to be happening in the scene. It is such a horrible trap that I've fallen in and all it brings for me is frustration. So that's the point where I have to take a breath, step back in my head, and really try to look at what's actually going on. What is actually being said to my character, what is the other character actually doing.
So. Those are aspects of RP that
I try to keep in mind and that I struggle with personally. I feel comfortable offering that much, at least.
There is an awesome thread on meta in XMM and it might be a fun read for you, since you mentioned meta in one of your questions:
viewtopic.php?f=6&t=44I hope this was in any way helpful!