imagedepot.net - not very searchable, and is on a net. Could be branded and used as an image website though. I'd say $xx to low $xxx,
possibly mid 3 figures if you get lucky with the end user, but that's very rare. Given the "depot" word you might find it never sells as there are so many other "image" names available.
tubenonstop.com - Sounds a little "urky" (sorry). something like "NonStopVids.com" would be better, tho still not great, and the end buyer potential is very low.
You could stick it on Sedo/other
free marketplaces and see if someone bites, but when considering there being a lot of better alternatives it's unlikely to ever sell "IMO".
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The names are not terrible per-se (given some of the really bad ones we buy as newcomers), they're just not very commercial or sell-able. You should do some studying of sales and the market places. What prices domains are listed for and if they have bids, what has sold on Sedo, Godaddy (end users), and here on NP (other domainers looking to make a profit too). See what prices names sell for on Namebio.com, DNJournal, etc but take with a pinch of salt as no two names are the same and previous sales are simply guides and only part of the larger evaluation and learning process.
This will help you buy names with more commercial value and make it easier sell and make money
Without this knowledge you have no possible reason to believe the domains you chose to buy have any value, so how can you buy them? You have literally said "I do not know the marketplace, or if these domains are valuable, but I'm going to buy them anyway" - we all did and still do to some degree, but initial learning is a must to avoid buying very low quality names
Hope that helps.
Also some good reading:
https://www.zandibot.com/10-mistakes-new-domainers-should-avoid-making
https://www.zandibot.com/how-to-pick-two-word-domains
https://www.zandibot.com/three-steps-to-domain-investing-victory-in-2016
