ok.......thanks!
do this:
- have these photos in front of you or the scans on screen in front of you
- stand up (make sure chair is clear of body)
- close your eyes (NOT NOW

)
- turn 180 degrees
-
think and believe this : 'i have never seen a photograph in my life. i've never taken a photo in my life. i don't have a son. i've never seen a beautiful child in my life. i am alone'.
- open your eyes
- turn to the prints or screen
what is the first thing that you notice? your vertical lines are leaning. you foresaw the shot enough to include them as an internal frame, but they are leaning.
the expressions you captured are priceless. you did a fine job keeping an environmental/portrait photo uncluttered; not easy to do. it's good stuff that you posted. if that is indeed your son, he's quite the 'heart breaker' and these photos will bring joy and laughs for time to come (oooooooooooooh, i know this).
two things as mentioned: if you only ever want 4x5 prints, 400 speed is fine. the operative word is 'ever'. that's a mighty long time. if you shoot 100, you can enlarge 'til you are content and have some nice wall hangin' memories. also, tmax is.....eh. ya know what? do this: go to the same location and shoot ilford xp2. you see the white zones in the photos? see how they are just 'white' and don't have much texture? xp2 is much more controlled with white areas. shoot a roll of xp2; if you aren't happy, hell, i'll send you a roll of your choice. keep in mind that xp2 has to be developed at your local one hour lab (processed the same as color). the prints will come out with a nasty sepia tone as the film is truly meant to be printed on b&w paper. if you can't then have the negs printed on such paper, then shoot kodak tcn which goes through the same process, but prints fine on the paper from labs.
keep shooting and posting!!!!!!!