@Giselle One of the things you could focus on is the illusion of depth and focal point. For example in the piece with the caravan, the background could be more blurred as to put the caravan as the central focus, it would also create contrast between softer and harder edges. Adding atmospheric fog in the background would also heighten the illusion of depth and distance and would contribute to making the 2d space feel larger. Apart from that, you could try looking at how colors work within shadows as they aren't just a darker version of the local color. I suggest Marco Bucci's "Understanding Shadow Colors" video. Best of luck!

@Giselle great set of digital paintings. These have very good appeal. I particularly like the exciting use of colors. Richard Schmid’s book Alla Prima II has great chapter on self diagnosing one’s own paintings. While his perspective and book is entirely about traditional oil painting, the process of critical thinking applies to any artwork. At highest level, its all about examining work carefully as you progress for accuracy in achieving your desired vision and choices for each of the following- shapes, value, color and edges. Perhaps you look at work and ask what is an edge that looks off to you, could it be that hard edge was used and soft edge is needed, then experiment would that change make it better? Ask have you reserved your areas of greatest contrast in edge, value or color for your desired focal point of attention? Generally speaking in this group i see lots of hard edges. Also, the oranges painting while very cool looking stylewise, does flatten a bit in bowl and and oranges themselves because there are not the super smooth soft gradations in value typical of rounded spherical objects in real life. That’s a style choice to consider. Also, on a side note, consider inventing/ designing or even omitting cast shadows when they contradict the shape of object underneath, like when a straight cast shadow falls on orange it will tend to break illusion of roundness of orange form. I hope that helps.