Wow, you're a hard worker! If you keep this pace up you'll be selling instructional dvds soon. I like the mice studies a lot and I think that long nosed creature is a great candidate for a more long term project in PS. Maybe just push his right leg back a bit to balance his weight out.
I thought about your questions and y'know, looking at these recent batches, I actually think the strongest ones are the fast ones. They have much more dynamic flow. The fact that you are doing so many studies is great because as your mental library of forms grows it will give more plausibility and interest to these fast sketches. In general, your approach to learning seems effective and disciplined. I would definitely get a set of gray markers and try sketching with those to vary your approach. Start with the 10 percent to realize forms and volumes, then refine with gradually darker tones. Doug Chiang has a good breakdown of
marker sketching
Another awesome resource is PSG's
art tutorial. There is a checklist of dos and don'ts you can mentally refer to when creating a drawing and this tutorial has virtually all of them.
For digital sketching, I recommend you try to working dark to light if you haven't already. I like to take a dark gray, blob out a silhouette, carve the edges into something more pleasing while laying in gradually lighter tones to define the shapes (opposite of the markers). Leave your darkest darks and lightest lights for last. It's dramatic and economic as you can leave a lot in shadows sometimes.
Justin Sweet does this a fair bit. Look at his pencil sketching too. They tend to be very loose, giving just the right amount of info to be painted over.
Another thing you could try is to work on mid toned paper. Use a china marker or white pencil crayon for lights and whatever you want for darks. You get pretty pleasing, mature looking results from that tactic.
Anyway, I hope that answers some of your question. You probably have heard a bunch of this before, but it's effective, fun stuff worth mentioning. If those guys I linked to don't give you enough, haha, you can check out my humble progress shots I'll be posting in the next while in the ol' sketchbook.
Keep it up man!
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