one - close ups are tough with wide lenses, and the backlight (that round bokeh looking thing, the sun? :P right on the flower) hurts this image. looks maybe OOF, stop down just a touch with those high contrast scenes, i see some CA creeping in.
two - again, close ups with wide lenses. boring light, boringer composition.
three - nice shot, kinda awkward expression. my kids are the worst about that, i've just about given up getting them to look at the camera.
four - good shot but cropped a bit high on his torso which left too much head room.
five - this had a lot of potential, i see what you were going for. the skinny tree sticking up right in the center is what blows it for me. Try some more of these type shots.
b/w conversions are looking good, full tonal range, good contrast.
seems like you are doing a lot of pics of the boys along roadsides and trails, might give a few shots at something else.
PSA: The above post may contain sarcasm, reply at your own risk | Not in gear database: Auto Sears 50mm 2.0 / 3x CL-360, Nikon SB-28, SunPak auto 322 D, Minolta 20