Sprout seedlings

Hi this is my first year trying to grow some fruit and veg and although my tomatos are looking really good the same cant be said of my small veg plot.

i think my first mistake was to sow directly into the soil and not start off in the greenhouse, now i have a bed with so many weeds i cannot se if any of my beg has grown, these are sprouts, parsnips and carrots.

I would like to see what the young seedlings should look like so that I can remove the weeds. Any other tips will be great.