Very nice drawing of your wife, but as you mentioned, both drawings could benefit from a more definite angle of light.
The one of yourself, in particular, could also benefit from a wider range of values. Don't hesitate to go for those darkest darks wherever you see them. It is hard, though, to light one's self appropriately for a painting and still have enough light to paint by!
One more thing I noticed: watch the alignment of the eyes on the self portrait. The inner corners do not point at each other as they should
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