im sorry to say this but those shots are aweful. really bad.
not only are you using the standard WAD (low resolution 256 color textures) your models and levels also look really bad.
this is not meant to bring you down, really.
but its the truth. did you code it yourelf or did you use templates?
because if you used templates, i strongly suggest finding something youre good at first, and after you trained your skills in that, start a small project with someone else to produce something better...