those look really good!!
for the apple i think you need more gradients horizontally, it kind of looks nicely shaded at the top and bottom but kind of stands out in the middle too much... might need to do a litttle bit more blending.
the avocado looks good tho i think the bottom seedless avocado ended up being too bright
personally what i like to do is add a new layer on the very top, fill it with black and set the blending mode to color or brightness i forgot which - that makes everything grayscale so you can better compare the values
hmm what DO you like to draw?
I usually see u drawing muscly ppl so perhaps you can practice coloring skin or draw the hands holding something and color that?
maybe smol things like stuff u find in cafes.. lights, cups, delicious coffee/tea?