Joseph's shiny new sketchbook

[JosephCow]

Is your scene lit with multiple light source or is it lit by outside light?The problem with natural light is that the lighting is inconsistant on cloudy day and there little to no contrast when it cloudy not paying attention to the weather can be problematic in such case.Did you ever do plain air painting?If not 
Make sure your monitor setting are set on the right setting also who know maybe you change them by mistake.

Is your room lit by anything else than a window?Because in the shadow there is also little to no contrast.I don't know your budjet but a ajustable lamp could be a nice addition if your into doing still life.

There nothing wrong to drawing rally dimp lighting you just gotta be aware of your lighting to create the right mood.

I do have a lamp. I just wanted to do a set up in natural light with a window, I like how it looks, generally. I'd like to do more with natural lighting because it has an interesting effect.  I've done many, many paintings/drawings under lamp-light, so it's good to try different things.