jdef I dont recall reading what film you are using. I can tell you my experience with TMX in Rodinal was great, beautiful tones across the entire scale. The only thing I did not like is that it was a bit too grainy for my taste. So you might want to take that into account. Rodinal is a wonderful and easy to use developer and you should see good results. For portraits I think it will be a very nice developer, you will get creamy whites and very contrasty shadows. Grain with a contact print should not matter so I say go for it!
As to your first print upload I will be glad to tell you what I think in private as I dont wish for this site to become a "critique" site. There are may other sites for that. Always remember it is just my opinion and I dont claim to have the "only" answer for anything. I am sure your efforts will be succesful, dont fret, trust in what you know and go ahead.
So stop posting and go take pictures......